If a client has ever reacted to a hair colour, a wax, a peel, or a nail product, that's not just a note for the next appointment — it's health data, and under UK GDPR it's treated as a "special category" (Article 9). That means it needs more care than a phone number or a booking time, and "I had it written in a notebook somewhere" is not a defence if something goes wrong.
Three things matter.
First, capture the detail, not just the flag. "Allergic to PPD" is more useful than "allergic." Record the product or ingredient, the reaction, the date, and who recorded it. A vague note is the one that gets missed.
Second, make it impossible to miss at the chair. A safety record buried in a separate file gets skipped on a busy Saturday. It should surface automatically when you open that client's booking — before the service starts, not after.
Third, store it lawfully. Special-category data needs a clear basis, restricted access, and a retention limit. A shared spreadsheet or an open WhatsApp chat fails all three.
Every client, remembered — safely.
SAY-OS keeps each client's contraindications, allergies and history in one place, and flags them at booking — so the right call happens before they're in the chair.
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