Hair Colour Formula Cards and Product Usage Log

Hair Colour Formula Cards and Product Usage Log is an offline app (one HTML file in a zip) for the colour room. You list your tubes, developers and lighteners with pack size and pack cost, write each client's formula as lines of grams, and log a visit each time the formula is used. Stock on hand, product cost per visit and cost against the charge are calculated for you.

The problem it removes: The formula that worked last time is on a paper card or in a stylist's head, so a repeat client gets a different shade when that stylist is off. Product is poured by eye, nobody knows what a full colour really costs in product, and a tube runs out in the middle of a service. This app keeps the formula, the stock and the cost in one place.

What is inside:

• Formula cards per client with shade lines and grams, technique notes and the cost of the mix
• Colour visits that use a formula times a batch size (1, 1.5 or half a batch for a touch-up)
• Stock per product from opening grams, packs received, waste and stock count corrections, minus what visits used
• Reorder list of products at or below the level you set, with packs left
• Product cost against the charge for each visit, and by month
• Clients due back for colour with a WhatsApp message, and an optional patch test date check using your own salon rule
• Example data you can load in one click, a Start here guide and an Honest limits panel
• JSON backup and restore, CSV export, and CSV import with a check of every row before anything is added

Who it is for: hair salon owners, senior stylists and colourists who mix colour for repeat clients and want the formula, the stock and the cost per client in one offline file instead of cards, notebooks and guesses.

What it is NOT: It does not decide shades, strengths or safe mixes, and it gives no advice about hair or skin: it records what your stylists mixed. It does not scan barcodes, does not take payments and does not manage the appointment diary. The patch test check only compares dates against the number of days your salon enters. It is not legal, tax or accounting advice, it is not connected to any government system, bank or messaging service, and it does not file or send anything by itself. UAE e-invoicing is not part of it.

Your data stays on this device in your browser. Back it up with Export; clearing browser data loses it otherwise.

Verified by us: scripted tests in Chromium (182 checks through the real screens: adding, editing and deleting records in every table, required-field messages, backup then clear then restore, CSV export then import, keyboard order, print layouts rendered to PDF, no horizontal scrolling at 375 and 1280 pixels, no network requests) and an independent recalculation by a separately written Python evaluator of 1949 calculated values (25 randomised rows plus the example data) with 0 mismatches. Safari engine (WebKit): smoke test passed; Firefox: could not be launched. Not tested: Firefox beyond what is stated here, and no real printer was used (print layouts were checked as PDF).