miFormulas is a perfume formulation app that runs as a single HTML file in your browser. It keeps your materials, your formulas with their full version history, and the variations you make of them, and it does the perfumery arithmetic: dilution-corrected percentages, batch scaling, dilution changes, predilutions, an IFRA check, weighing sheets.
A few things set it apart. It imports your formulas and materials from Formulair, complete with notes, dilutions and colour marks (section 19). You can select several lines of a formula at once and act on them together: mark them, shift their dilutions, or bundle them into a predilution (sections 11 to 13). You can let your own AI assistant turn a photo, a PDF or a spreadsheet into a formula ready for import (section 18). The bench view lays a formula out in open groupings of materials, the way a Ryan Parfums-style bench sheet does, so that batches are prepared in the order you weigh them (section 14). And you can install it as an app with its own icon on Windows or macOS (section 5).
There is nothing to install, no account, and your data stays in a file that you own.
And it will keep working. Before leaving Formulair the question was whether the next app would still exist in five years: many are one developer's hobby, and hosted ones stop when the hosting stops. miFormulas is one file that runs without any server, so your copy keeps working as it is, whatever happens to the site or the author. Your data is a plain JSON file you can read with any text editor. And the source is free software under the GPL: if the author loses interest, anyone can take it further.
This manual describes build 260908d. The build number of the copy you are using is shown next to the name in the top-left corner of the app.
Open https://miformulas.com in a modern browser.
Screenshot in the online manual: The start screen of miformulas.com.
The start screen offers three ways in:
Documents\miFormulas\backups (Windows) or Documents/miFormulas/backups (Mac).Whichever way in you take, you land on the Welcome page with four tiles (formulas, versions and variations, materials, to order), the recently edited items, and the import and export buttons. Pick a formula or material in the list on the left, or create a new one with + New formula and + New material in the header.
Screenshot in the online manual: The Welcome page after loading the starter set, with the amber storage bar.
Every change is saved automatically a few seconds after you make it; Ctrl+Z undoes it. Deleting a line, a version, a variation, a formula or a material always asks for confirmation.
miFormulas stores everything in one JSON file, miformulas-data.json. The app can keep that file in three places, and the top-right of the header always tells you which one is in use ("Saved 14:02 · this browser", "Saved 14:02", "Connected to server").
In the browser. On miformulas.com the app keeps the data in the browser's own storage on that computer. This is the quickest way to try things out, and it is fine for everyday use if you download a Backup regularly. Two things to know: every browser has its own storage (Edge and Chrome on the same computer do not see each other's data), and a browser that is set to clear site data when it closes will take your formulas with it. The app asks the browser to keep the storage persistent; as long as the browser has not confirmed that, an amber bar under the header reminds you to make backups.
Screenshot in the online manual: Browser storage: the amber bar reminds you, and Save to a data file… moves your work into a file (Chrome and Edge).
In a file. In Chrome or Edge the app can read and write a data file on your disk directly. You see the file, you can copy it, put it in a synced folder, and open it on another computer. The app remembers which file you used; the next time you open it you click Reopen and, if the browser asks, allow it to write to the file again. This works with the downloaded app (section 4) and just as well on miformulas.com itself: Save to a data file… (in the amber bar or in Settings) moves your work from the browser's storage into a file, Open data file… on the start screen switches to an existing file, and the site remembers the file for next time. For a site the browser can also remember the permission itself, in particular once the site is installed as an app: the app then opens straight into your data, and Reopen only appears when the browser wants a fresh click. Combined with "Install as an app" (section 5) that gives you an app with its own icon, your own data file, and updates that arrive by themselves. Firefox cannot write to files: on the site you work in the browser's storage and use Backup to save, and a downloaded copy opened in Firefox is read-mostly (pick the data file once, the app keeps a cached copy, and Backup is the way to save). Safari has no direct file access either, so expect the same there: browser storage and Backup; it has only been tried on the start screen.
Screenshot in the online manual: Next time, the start screen offers Reopen for the remembered data file.
On a server. If you have a web server with PHP (a NAS at home, a small hosting account), put the app and the endpoint server/data.php on it and every device with the token shares the same data. The server refuses to overwrite changes made from another device in the meantime and keeps a daily snapshot. Section 20 explains the setup.
Whichever mode you use, Backup in the header downloads a copy of the data file with a date and time in its name, and Open data file… on the start screen opens any such file. Moving between modes is nothing more than a Backup on one side and an Open on the other.
Nobody but you. miFormulas runs entirely on your own computer, inside your browser, and your data lives where you put it: in the browser's storage, in a file on your disk, or on a server you own. There is no account, no cloud, no telemetry and no update check, and the author of the app has no way to see your formulas. The app never uploads anything.
This is everything the app does on the network:
data.php server sits next to it. The browser also fetches the small app manifest and the icons from the same site, which is what makes "Install as an app" possible.No analytics, no fonts or scripts loaded from elsewhere, nothing sent in the background. The Formulair importer reads your database in the browser and sends nothing; its database engine (sql.js) is embedded in the file.
miformulas.com is served by GitHub Pages, a static file server: it hands the same HTML file to everyone and receives nothing back. Like any website, its logs record that a page was requested from an address. If even that is more than you want, download the app once and never visit the site again.
The AI prompts in docs/ai-prompts.md are the one exception, and you choose it yourself: what you paste or attach in an AI chat goes to that AI provider, under its terms, never to miformulas.
Check it yourself. The whole app is one readable file, and the source is public under the GPL at https://github.com/miformulas/miformulas.
miFormulas.html (or index.html) in a text editor and search for fetch(. There are four in the code: the starter set, the data.php probe, and the two calls to your own server (load and save); the fifth hit is this sentence, because the manual is embedded in the app as the Help text. Search for http and you find the address of the starter set, the Google search address used by the order list, the licence links, and the links in the embedded manual. Outside this paragraph there is no <script src=, no XMLHttpRequest, no sendBeacon and no WebSocket.These checks also tell you whether a copy of the app that reached you by another road was changed. Take the app from miformulas.com or from the repository.
There is nothing to install. The whole app is one file, index.html on the site and miFormulas.html once downloaded, and it runs in any modern browser. Four ways to use it, and for most people the first two together are the right ones:
Use the site, and keep your data in a file of your own. Open https://miformulas.com and click Start with the starter set. Your work is now kept in the browser's own storage; an amber bar under the header says so and offers Save to a data file… (Chrome and Edge). Click it: the app explains that it will create your data file, then asks where to keep it. Choose a folder of your own, for instance Documents\miFormulas, and keep the name miformulas-data.json. From then on the app saves to that file, the bar disappears, and the next time you open the site it continues with that file. Then install the site as an app (section 5) and you have an app with its own icon, your own data file, and updates that arrive by themselves. If you prefer to stay in the browser's storage, use Backup regularly to download a copy of your work.
Screenshot in the online manual: The app explains what it is about to create…
Screenshot in the online manual: …and the browser asks where to keep miformulas-data.json.
Keep the app itself on your own computer. On the start screen of miformulas.com click Download the app. The file miFormulas.html lands in your Downloads folder. Give it a folder of its own, for instance Documents\miFormulas (Windows) or Documents/miFormulas (Mac), and open it there in Chrome or Edge. The start screen now offers Start with the starter set; choose it and the app explains that it will create your data file, then asks where to keep it. Put miformulas-data.json in the same folder as the app and keep that name. From then on the app saves to that file automatically, and the next time you open the app it offers Reopen "miformulas-data.json". Make a subfolder backups in the same folder for the copies that Backup makes.
Screenshot in the online manual: The downloaded app, opened from your own computer.
Screenshot in the online manual: Start with the starter set creates the data file next to the app.
Coming from Formulair? Open https://miformulas.com/formulair-import.html. It converts your Formulair database in the browser and nothing is uploaded. Section 19 has the steps.
Two things about the downloaded app that surprise people:
If you already made formulas on miformulas.com before downloading the app, click Backup there first and use Open data file… in the downloaded app to continue with that file.
Updating is the same as installing: download the new miFormulas.html and replace the old one. Your data file is separate and stays untouched.
If you want miFormulas to feel like a program of its own rather than a tab, install it as an app: two minutes, no download, nothing difficult. It then opens in its own window without address bar or tabs, has its own icon in the taskbar, the Start menu or the Dock, and shows up when you switch between programs. Underneath it is the same app in the same browser: the installed app and the site in a normal tab share their data, their remembered data file and their updates.
Browsers only offer this for pages served over https, so it works with miformulas.com and with your own server if that has an https address. A downloaded miFormulas.html cannot be installed this way; the last part of this section shows a shortcut that comes close.
The one-click way (Chrome and Edge, Windows and Mac). Open https://miformulas.com. When the browser can install the site, the start screen shows the link Install as an app, and the same button appears at the top of Settings (⚙) once you are working. Click it, and the browser's own install dialog appears with the name and icon; confirm, and the app opens in its own window. Nothing is downloaded and nothing else is installed: the browser does the work, and the installed app shares its data, its remembered data file and its updates with the site in a normal tab. Do this after you have saved your data to a file (section 4): Chrome and Edge remember the permission to write to that file for an installed app, so from then on the app opens straight into your formulas, without Reopen and without questions.
Screenshot in the online manual: The Install as an app link on the start screen.
Screenshot in the online manual: The browser's own install prompt (Edge).
Screenshot in the online manual: After installing, Edge offers to pin the app to the taskbar and the Start menu.
Screenshot in the online manual: The installed app in its own window, with its own icon in the taskbar.
If the link does not appear, your browser did not offer the installation; the menu routes below do the same.
Microsoft Edge. Open https://miformulas.com. Click the ⋯ menu (Settings and more) in the top-right corner, then Apps, then Install this site as an app. Edge proposes the name "miFormulas" and the app icon; click Install. Edge then offers to pin the app to the taskbar and the Start menu, to create a desktop shortcut and to start it with Windows; tick what you want and confirm. The app is now listed under Apps in the Start menu like any other program. To remove it, open the app, click ⋯ in its title bar and choose App settings, then Uninstall; or use Windows Settings, Apps, Installed apps.
Screenshot in the online manual: Edge: ⋯, Apps, Install this site as an app.
Screenshot in the online manual: The install dialog from the menu route.
Google Chrome. Open https://miformulas.com. Click the ⋮ menu, then Cast, save and share, then Install miFormulas… (Chrome knows the app by name; for a site without a manifest the item reads "Install page as app…"), and confirm with Install. The small install icon at the right end of the address bar does the same. Chrome puts the app in the Start menu; right-click its taskbar icon while it runs to pin it. To remove it, open the app, click ⋮ in its title bar and choose Uninstall miFormulas….
Screenshot in the online manual: Chrome: ⋮, Cast, save and share, Install miFormulas…
The downloaded file. Edge and Chrome do not install local files as apps, but a shortcut can start the browser in app mode with your local copy. Right-click the desktop, choose New, Shortcut, and as location paste one of these lines, with your own path to the file:
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --app="file:///C:/Users/YourName/Documents/miFormulas/miFormulas.html"
"C:\Program Files\Google\Chrome\Application\chrome.exe" --app="file:///C:/Users/YourName/Documents/miFormulas/miFormulas.html"
Name the shortcut miFormulas. To give it the miFormulas icon, right-click the shortcut, Properties, Change Icon…, Browse…, and pick miformulas.ico from the icons folder of the ZIP (or download it from https://miformulas.com/icons/miformulas.ico). The window that opens has no address bar and gets its own miFormulas icon in the taskbar, separate from the browser. The data file and the Reopen behaviour are exactly as in section 4.
Screenshot in the online manual: The shortcut's Target: the browser in app mode with your local copy of the app.
Screenshot in the online manual: Change Icon… with miformulas.ico from the icons folder.
Safari (macOS Sonoma 14 or later). Open https://miformulas.com, then choose File, Add to Dock. Keep the name miFormulas and click Add. The app appears in the Dock and in the Applications folder of your home folder; open it from either. To remove it, drag it from your home folder's Applications folder to the Bin. Keep in mind that Safari cannot write to a data file: the Safari app keeps your data in Safari's storage, so download a Backup regularly, or use Chrome or Edge if you want a data file.
Screenshot in the online manual: Safari: File, Add to Dock.
Screenshot in the online manual: The Add to Dock dialog: keep the name miFormulas and click Add.
Screenshot in the online manual: miFormulas in the Dock.
Chrome or Edge. The menus are the same as on Windows: in Chrome ⋮, Cast, save and share, Install miFormulas…; in Edge ⋯, Apps, Install this site as an app. The app lands in the Applications folder (Chrome Apps) and in Launchpad; drag it to the Dock to keep it there. Chrome and Edge on the Mac can write to a data file, so Open data file… and Reopen work as on Windows.
The downloaded file. Neither Safari nor Chrome installs a local file as an app. What works is a small launcher: open Automator, create a new Application, add the action Run Shell Script and paste, with your own path:
open -na "Google Chrome" --args --app="file:///Users/yourname/Documents/miFormulas/miFormulas.html"
Save it as miFormulas in your Applications folder and drag it to the Dock. To give it the miFormulas icon, open miformulas.png from the icons folder (https://miformulas.com/icons/miformulas.png) in Preview, select all and copy, then select the launcher in the Finder, press Cmd+I and paste onto the small icon in the top-left corner of the Info window.
Screenshot in the online manual: Automator: a new document of the type Application.
Screenshot in the online manual: The launcher: the action Run Shell Script with the open line.
The header holds, from left to right: the list toggle (☰, also Ctrl+B), Home, + New formula, + New material, the save state, Undo and Redo, Save (saving is automatic; this forces it now, also Ctrl+S), Backup, the reload button (⟳, use it after an update), the theme button (◐ Auto, ● Dark, ○ Light), Help (?, this manual inside the app, without the screenshots) and Settings (⚙).
Screenshot in the online manual: The header.
The list panel on the left has three tabs. Formulas and Materials group their items by category with a coloured dot; the counter after each formula reads "3v · 1var" for three versions and one variation. To order is the shopping list. The search box filters the list: formulas by name; materials by name, CAS number and supplier, and from three characters also by the text in their description (those hits are marked with ✎). Typing "starter" lists the starter set.
The page on the right shows the selected formula or material, the order list, or the Welcome page.
Screenshot in the online manual: The list panel on the left and a formula page on the right.
On a phone the list and the page take turns; the app is read-only there unless it can save (server, browser storage or a writable file), so that a tap cannot lose anything.
A material is anything you weigh: a raw material, a natural, a base, a solvent, one of your own predilutions. Its page holds the name, CAS number, category (with its own colour, used for the dots and the pyramid), supplier, the amount purchased, cost per gram, IFRA limit, whether it is a solvent, where it is stored (cupboard, fridge, freezer), and its position in the olfactive pyramid (Top, Top-heart, Heart, Heart-base, Base, or ?). Below that come the dilutions, the optional stock ledger, a free description, and the list of every formula the material appears in; click a name there to jump to it.
Screenshot in the online manual: A material page: fields, dilutions and the stock ledger.
Dilutions. A material offers only the dilutions you actually own. If you have Iso E Super at 100 % and at 10 % in ethanol, add both; if you only ever bought a 10 % dilution of a costly absolute, add only 10 %. One of them is the base dilution, the concentration that new formula lines start with; any dilution can be the base, and 100 % is not assumed. Deleting a dilution that formulas use is allowed: those lines keep their value, it only disappears from the pick list.
Solvent. Tick this for ethanol, DPG, IPM, TEC and the like. Solvent lines carry no aromatic content: they do not count in the relative percentages and they are what the dilution tools exchange against.
IFRA limit. Enter the limit in percent of the finished product for Category 4 (fine fragrance), taken from the standards library on ifrafragrance.org. Two special values: 99 means checked, no restriction; empty means not yet checked. The IFRA panel of a formula uses these figures (section 16).
Storage. A material stored in the fridge shows a ❄ next to formula lines that use it at its base concentration, also on the printed weighing sheet, so you know which bottles to fetch first.
To order. A material you do not have yet, whether you added it from the order list or it came out of an import, carries the label "to order" and a 🛒 in the list until it is delivered.
Materials come from + New material in the header (name, category and base dilution; the rest is filled in on the page), from the order list, from an import, or from the predilution tool. A material can only be deleted when no formula uses it; the page tells you which formulas do.
Filling in CAS numbers, IFRA limits, pyramid levels and descriptions for many materials is tedious; docs/ai-prompts.md has a prompt that lets an AI assistant propose them from the All materials (Excel) export, for you to check and enter.
What miFormulas does not have is a built-in materials database of the kind some paid apps ship, where a new material arrives with its CAS number, IFRA limit and an odour description already filled in. The names, CAS numbers and IFRA limits of such a database are facts and could be shared freely; the odour descriptions are somebody's writing and cannot. For now the starter set, the Formulair import and the AI prompt above cover most of the ground; a shared materials file that can be imported on its own is an idea for later.
A formula is a named recipe in a category. Its history is a row of versions: v1, v2, v3 and so on, each with a date, an optional label, notes and its own lines. Only the latest version can be edited; every earlier version is a frozen record of what you did, kept exactly as it was. When you want to change something, create a new version (+ New version copies the version you are looking at) and edit that. Deleting a version is possible, deleting the past is not: a new version never rewrites an old one.
Screenshot in the online manual: The version row: the version list, + New version and Compare…
A variation is the same recipe in another presentation: the same formula at 20 % instead of 15 %, with the costly material taken from the 10 % dilution instead of the pure one, or made up as a 44 g batch instead of 100 g. A variation carries a label of your choice ("20%", "soap", "44gr") and comes in two kinds:
Screenshot in the online manual: New variation: a label, an optional target total, and which version it follows.
Formulas imported from Formulair are frozen too (section 19): you read them, compare them and copy them, but to work on one you make a new version.
Move into… appears on an imported formula that has one version and no variations, which is what every formula from the Formulair import looks like. It makes that formula a new version of another formula, or a frozen variation of one of its versions, and removes it from the list. Lines, notes, date, colour marks and trial log come along, and the import name stays on the version or variation as a reference. Everything is one Undo step. This is how you group the flat Formulair import (section 19).
Screenshot in the online manual: A live variation "20%" made up as 50 g, following the latest version.
Copy to new formula takes the version you are looking at as v1 of a new formula, optionally with the variations. Rename and Change category do what they say; categories are shared between formulas and get a colour dot.
A formula line is a material, a dilution and a weight in grams. To add one, type the material's name in the Add material… box under the table (the list suggests as you type) and click Add line; the line starts at the material's base dilution with weight 0. Type the weight, choose another dilution from the list if you have one, or pick custom… for a percentage you do not stock (the app then warns with ⚠ that this dilution is not in your list, see section 11). Remove a line with ✕.
Screenshot in the online manual: A formula page: the lines table with dilution, weight, rel % and abs %.
If you add a material that is not in the library, the app offers to create it as a "to order" material: it goes on the order list, and the line is marked until the material is delivered.
The table can be ordered by original entry, by category or by pyramid level (top to base), or by clicking a column heading; the order is also used for the printed sheets. The little icon before each material name shows its pyramid level in the colour of its category.
Below the table sit Batch scaling (section 12), Notes, the Trial log (section 13), the Categories panel and the IFRA check (section 16), and Mark as prepared for the stock ledger (section 17).
The table shows two percentages per line, and they follow perfumery practice rather than plain weight shares.
The content of a line is its weight corrected for the dilution: 2 g of a 10 % dilution is 0.2 g of material.
Rel % is the content of a line divided by the total content of all non-solvent lines. The column adds up to 100; solvent lines show a dash, because they carry no material. This is the composition of the concentrate, independent of how much ethanol is around it.
Abs % is the content of a line divided by the total weight of the formula, solvents included. The total of this column is the concentration of the mix: a formula with 15 % abs in total is a 15 % concentrate. Solvent lines show their share of the weight here.
The cost of a line is weight × cost per gram × dilution, and the total cost is what the batch cost you in materials.
These rules are what makes the dilution tools work: changing a dilution while preserving rel % keeps the smell the same; the abs % and the total weight then tell you what happened to the strength and the batch size.
Change the dilution of a line by choosing another value in its dilution list. Because a different dilution means a different weight for the same amount of material, the app asks how to proceed:
Screenshot in the online manual: Changing a dilution: the three ways to proceed, with the effect on weight and solvent.
The same question comes up when you replace a material by another one whose dilutions differ.
Lower and Higher in the tick bar shift all ticked lines to the next lower or higher dilution that the material offers, preserving rel % and exchanging the solvent in one go (so the formula needs a solvent line); lines already at their lowest or highest are skipped and reported.
Screenshot in the online manual: Ticked lines and the tick bar: marks, Lower and Higher, Create predilution…
In a live variation the dilution list works the same way but stores an override instead of touching the version, so the variation keeps following the formula.
Lines with a dilution you do not stock are marked ⚠, typically after an import. They compute correctly; when you next make a version, convert them to a dilution you have with "preserve rel % and exchange solvent".
Batch scaling sits under the table. Apply factor multiplies every weight (2.5 turns a 40 g trial into 100 g). Target total rescales the whole formula to a given weight. Set EtOH for target abs % changes only the ethanol line so that the concentrate reaches the percentage you type, adding an ethanol line if there is none; the hint shows the maximum reachable with no ethanol at all. On a live variation, factor and target set the variation's target weight instead. On a read-only entry the target field is still there, because the printed weighing sheet uses it: type 10 g and print a 10 g weighing sheet without touching the formula.
Create predilution… bundles ticked lines into a separate, weighable mix. Perfumers do this for the trace materials: instead of weighing 4 mg of five things, you weigh 4 g of each once into a premix and dose 0.4 g of that. The app takes the ticked lines as displayed, lets you name the predilution and choose a batch factor (the preview shows the mix weight, its aromatic strength and the smallest line), then creates three things at once: a frozen predilution formula in the category "Prediluties", a material in the category "Predils" with the aromatic concentration as its dilution and the cost per gram computed, and a new version of your formula in which the ticked lines are replaced by one line of the predilution at the same content. Everything is one Undo step.
Screenshot in the online manual: Create predilution: name, batch factor and a preview of the mix.
Tick lines with the checkboxes on the left (Shift-click ticks a range) and use the tick bar: mark them red, green, blue or yellow, unmark them, or clear every mark. Marks are per version, or per variation for a live variation, and they carry over into new versions and copies. Use them as you like: what changed, what to smell for, what to check.
Notes is a free text per version or variation, shown on the formula sheet. The Trial log is a dated list of short entries ("day 3, macerated, top too sharp") that also prints on the formula sheet.
Bench view (the button next to the formula name) is something you will not find in other formulation apps. It is inspired by the way Ryan Parfums builds his batches in his YouTube videos: start with the core materials, smell, then add the next group of materials step by step. Bench view turns the formula table into that kind of worksheet. The lines start in the Unsorted column on the left; drag them into named groups on the right, or tick several lines and choose Move ticked to…. The Unsorted column keeps every sort order of the table (original, A to Z, dilution, weight, rel %, category, pyramid), so sorting by category, ticking all the rose materials and moving them into one group takes a few clicks. Five groups are there to start with; + Add group makes as many more as your batch needs, and you can rename, reorder and delete groups as you like. Each group shows its line count, weight, rel % and aromatic strength, so you see what each step adds to the batch. The arrangement is saved with the version or variation. Print bench sheet prints the groups with a checkbox per line, in the order you will weigh them.
Screenshot in the online manual: Bench view: the Unsorted column with its own sort order on the left, the groups you build the batch with on the right.
From the table view, three buttons under the lines:
Printing uses the browser's print dialog; choose "Save as PDF" there for a PDF.
Compare… (shown as soon as a formula has two entries) puts two versions or variations side by side, aggregated per material: weight and dilutions in A, weight and dilutions in B, rel % in each, and the difference in rel %. Lines only in B are green, lines only in A red, changed lines yellow; the default order puts the largest changes first, and the totals show the weight and the concentration of both. Change A and B with the two lists and close with Close compare.
Screenshot in the online manual: Compare: two versions side by side, aggregated per material, largest change first.
The IFRA check panel judges the formula against the limits you entered on the materials. It takes each material's rel %, multiplies it by the concentrate dosage (by default the formula's own abs % total, but type another figure to see the same concentrate at 12 % or 20 % in a finished product), and compares the result with the material's limit. The heading says at once whether the formula is within limits or how many materials are over; the table shows the restricted materials with their share in the product, their limit and the percentage of the limit that is used, the worst first. Materials without a limit entered are listed as not yet verified. The check is a help, not an IFRA certificate: it knows only what you entered, and only for the product category you had in mind when you entered it.
Screenshot in the online manual: The IFRA check panel: materials over their limit come first.
The Categories panel shows how the non-solvent content is spread over material categories, dilution-corrected, with a bar per category. The pyramid drawing above the table does the same per pyramid level.
Screenshot in the online manual: The Categories panel.
Stock is an optional ledger per material, in grams of the base concentration. Open the Stock panel on a material and set a stocktake (what is in the bottle now) to start tracking. From then on purchases add, and two things deduct: Dilution made (you made 50 g of a 10 % dilution, so 5 g of base left the bottle) and Mark as prepared on a formula, which deducts every base-dilution line of tracked materials, once per version or variation. Purchases in millilitres are converted with the material's density; without a density they are logged but not counted. The ledger follows the base material only, not the dilutions you made from it: a formula line at 10 % does not touch the stock, and an empty bottle of dilution is no problem as long as the base material is still there, because you can make a fresh dilution and log it as Dilution made. The estimate is only as good as the entries; the ledger keeps the last events so you can remove a wrong one.
To order is the shopping list. Add a material from the list itself (existing or new), with Add to order list on a material page, or automatically when a formula or an import mentions a material you do not have. Each entry has a note, an amount and unit, a price and a product link; Search opens a Google search limited to the web shops you listed under Edit shop list (the list starts empty; add the shops you buy from, one domain per line). Delivered closes an entry: it records the amount purchased, the price and the date on the material, computes the cost per gram from price and amount (millilitres via density), adds to the stock ledger if the material is tracked, creates the material if it was new, and removes the "to order" label.
Screenshot in the online manual: The order list.
The Welcome page has the import and export buttons.
Import formula… reads a miformulas-import JSON file: a formula transcribed from a photo or a document, either as a new formula or as a new version of an existing one. The import page shows every line with its match in your library, the total weight (a round number suggests a complete transcription), which materials are new (they are created as "to order") and which dilutions you do not stock (⚠). Nothing is converted: dilutions and weights come in exactly as written, and you convert in a next version. Confirm, and the formula opens. The file format is the small JSON shown in prompt 1 of docs/ai-prompts.md; anything that writes such a file can feed the app.
Screenshot in the online manual: The import page: every line with its match, the total weight, new materials and dilutions you do not stock.
Turning a photo, PDF or spreadsheet into an import file. You do not have to write that file by hand. Any AI assistant that can read images and files (ChatGPT, Claude, Gemini, Copilot and others) produces it from a photo of a handwritten sheet, a scan, a PDF or a spreadsheet: paste the ready-made prompt from docs/ai-prompts.md (also at https://miformulas.com/docs/ai-prompts.html), attach the photo or file, save the answer as a .json file and import it. The prompt tells the AI assistant to transcribe verbatim, to convert nothing, to use the name on the sheet and never to invent one, and to report the total weight and every doubtful line. Attach the All materials (Excel) export as well and the assistant uses the exact names of your library, so that every line lands on the right material. The app itself never talks to an AI; the conversion happens in the assistant of your choice, with your files, on your account. That separation is deliberate: a built-in AI would need a paid API key and would send your formulas to a third party, and neither fits an app that keeps everything on your own computer.
All formulas (Excel) and All materials (Excel) download the whole library as CSV files, one row per formula line with both percentages and cost, and one row per material with all its fields, stock and dilutions. Decimals use a comma, as Excel in Belgium and most of Europe expects; elsewhere open them with Excel's text import and choose the separators.
A word about Formulair first. I discovered perfumery together with Formulair, Sam Macer's formulation app for the Mac, and for an app built before the AI era it was remarkably complete: materials with their dilutions, formulas with notes and colour marks, costs, IFRA limits, stock. Only two things drove me to build miFormulas: the limits that come with a Mac-only app, and the possibilities that AI assistants now offer around a formulation notebook. The importer below is a bridge and a homage: everything you built in Formulair comes along.
The importer at https://miformulas.com/formulair-import.html reads the Formulair database entirely in your browser and turns it into a miFormulas data file. Nothing leaves your computer.
DataModel.sqlite in Formulair's own folder, which the Finder keeps hidden; the steps below get a complete copy of it onto your Desktop.In Formulair choose File, Close; Formulair writes its latest changes into the database file and quits by itself (a plain Cmd+Q does not always write them). In the Finder choose Go, Go to Folder…, paste ~/Library/Containers/co.uk.lux-terra.Formulair/Data/Library/Application Support/Formulair/ and copy DataModel.sqlite to the Desktop. A quick check: DataModel.sqlite should now carry today's date, and DataModel.sqlite-wal next to it should be small (kilobytes, not megabytes). If the -wal file is large, your latest changes are still in it: copy all three files (DataModel.sqlite, -wal and -shm) to a folder Formulair on the Desktop and fold them in with one line in Terminal, sqlite3 ~/Desktop/Formulair/DataModel.sqlite "PRAGMA wal_checkpoint(TRUNCATE);", then use the DataModel.sqlite from that folder.
Screenshot in the online manual: Finder: Go, Go to Folder… with the Formulair path.
Screenshot in the online manual: The Formulair folder: DataModel.sqlite with its -wal and -shm files. After File, Close the database carries today's date and the -wal file is small.
Open the importer, drop DataModel.sqlite on it, and wait a moment; the file can be large because Formulair keeps a long sync history inside it.
Screenshot in the online manual: The Formulair importer after reading the database.
Choose Download miformulas-data.json to get a data file for the downloaded app or your server, or Open in miFormulas in this browser to continue on the site straight away.
Every Formulair formula becomes a miFormulas formula with one frozen version, keeping its notes, date, category and colour marks per line, and every material comes with its dilutions, CAS, supplier, cost, IFRA limit, pyramid level, stock and description; categories keep their colours. Nothing is converted or renamed, and amounts are in grams.
Formulair is flat: "Aura v04" and "Aura v05" are two separate formulas there, and they stay separate here. Grouping them into one formula with versions v4 and v5, and turning "Aura v05 20%" into a variation, is a decision for you, made afterwards in the app with Move into… (section 8): open "Aura v05", click Move into…, pick "Aura v04" (the app suggests it when the names differ only in the number at the end) and choose version or variation; then rename "Aura v04" to "Aura". The app never groups by itself, because every perfumer names things differently. For a large library, docs/ai-prompts.md has a prompt that lets an AI assistant propose the grouping from the list of names, for you to review before you start.
The same conversion exists as a command-line script, tools/formulair-naar-json.py, for those who prefer a terminal.
With a server, every device you own works on the same data, and nobody has to remember to copy files. You need a web server with PHP (8.x) that you can put files on: a Synology or QNAP NAS with its web station, a Raspberry Pi, a small hosting account.
index.html and server/data.php in a folder on the server, and create a folder data next to them that the web server is allowed to write to. On a NAS this means giving the web server's user (often http) read and write rights on that folder; the endpoint tells you in plain words when it cannot write.data.php in a text editor and replace change-me-to-a-long-random-token by a long random string of your own. This token is the password to your data.miformulas-data.json in the data folder (a Backup from the app, or the file from the Formulair importer), or let the app create it.data.php next to itself, asks for the token once, and from then on says "Connected to server". On other devices, open the same address and give the same token; or open Settings and fill in the server endpoint and token by hand, which also works for a data.php at another address than the app.What the endpoint does: it returns the data with an ETag, accepts a save only when the ETag still matches, so that two devices can never overwrite each other (the app then shows a conflict warning: make a Backup, reload and redo the change), and it keeps a snapshot of the previous state in data/snapshots on the first save of each day, fourteen days long. Restoring one is copying that file over miformulas-data.json.
Reaching the server from outside your home is a matter of your network. A VPN such as Tailscale is the simple and safe way, and it can also give the server an https address, which the "Install as an app" options need. Do not put data.php on the open internet without https: the token travels in a header.
To update the app on the server, copy the new index.html over the old one; the data stays.
If you would like step-by-step instructions for your own device, docs/ai-prompts.md has a prompt that turns this section and data.php into a guided setup with an AI assistant.
Settings (⚙, also on the start screen) has the number format (browser default, or a fixed locale such as 1.234,56 or 1,234.56; input accepts both comma and point in any case), the server endpoint and its token, and a few buttons that depend on the situation: Install as an app when the browser offers it, Save to a data file… and Delete the data kept in this browser… in browser-storage mode, and Forget the remembered data file… when a file is remembered.
Screenshot in the online manual: Settings in browser-storage mode.
The theme button cycles between Auto (follows Windows or macOS), Dark and Light.
Shortcuts: Ctrl+Z undo, Ctrl+Y or Ctrl+Shift+Z redo (up to fifty steps), Ctrl+S save now, Ctrl+B hide or show the list panel, Shift-click on a checkbox ticks a range. On a Mac use Cmd instead of Ctrl.
Backup in the header downloads the complete data file, named with date and time (260907_1402_miformulas-data.json). Make one before anything you are not sure about, and regularly in browser-storage mode; keep them in a backups folder.
The app also keeps one daily snapshot in the browser: the state before the first save of the day. In file mode, if the data file is lost, the start screen offers Restore daily snapshot with its date; load it and use Backup to write it to a file.
In server mode the server keeps daily snapshots for fourteen days (section 20).
Open data file… opens any of these files. Undo covers everything you did since the app was opened, deletions included; it does not survive a reload.
The start screen only offers Reopen, and I want the starter set. The browser still remembers your data file. Click Reopen; if the file exists you continue with it, and if it is gone the starter set comes back. To start a second library next to the first, make a Backup, then delete the browser data for the site (Settings in browser-storage mode) or open another data file.
I opened the app in another browser and my data is not there. Browser storage and the remembered file belong to one browser. Use Backup in the first browser and Open data file… in the second, or switch to a file or a server, which every browser on the computer can open.
Edge asks every time whether the app may edit the file. That is the browser's rule for local files: one click per session, and the app cannot avoid it. For a site with https the browsers may remember the choice.
The amber bar says my data may be cleared. The browser has not promised to keep the site's storage. Click Save to a data file… in that bar to move your work into a file of your own (Chrome and Edge), or make backups, or check the browser's setting for clearing site data on exit.
A line shows ⚠. Its dilution is not in the material's list. Add that dilution to the material if you do have it, or convert the line to a dilution you have in a next version.
The IFRA panel says "not yet verified". Those materials have no limit entered. Look them up on ifrafragrance.org and enter the limit, or 99 if there is none.
Can I use it on a phone? Yes, with a server, or with browser storage on the phone. Without a way to save, the app is read-only on a phone.
Can the author of miFormulas see my formulas? No. Nothing leaves your computer unless you put it on a server of your own, and the app never contacts miformulas.com except to fetch the starter set when you ask for it. Section 3 lists every network request the app makes and how to verify that yourself in the code.
Where is the data of an installed app? In the browser that installed it, in the same place as the site: the app and the tab share their storage and their remembered file.
I want the site to forget my data file. Open Settings (⚙): the button "Forget the remembered data file…" makes the app stop offering Reopen. The file itself is not touched.
Where do I report a problem or suggest something? On GitHub, at https://github.com/miformulas/miformulas/issues (the Feedback link on the start screen goes there; writing there needs a free GitHub account). Say which browser you use and the build number shown next to the name in the header, and what you did; a Backup of a data file that shows the problem helps most, if you are willing to share it.
Screenshot in the online manual: Settings with a remembered data file: Forget the remembered data file…
miFormulas is free software under the GNU General Public License version 3, with two additional terms under section 7 of the GPL: the name miFormulas is reserved, and every copy must carry the attribution "Based on miFormulas by Mathieu Isenbaert, https://miformulas.com". The full text is in the files LICENSE and NOTICE in the repository at https://github.com/miformulas/miformulas.