The hard part of a booking app for salon work is the half hour while the colour develops.

The client record is the colour formula

The appointment is the smaller half of the record. What keeps a client in the chair is that the salon remembers the formula: shade numbers, developer volume, timing, how the ends took it last time and which stylist did it. That history is the asset. A list of past appointment dates is not.

The second reason to keep notes is allergy, and US law is specific about hair dye. FDA cannot act against a coal-tar hair dye for containing a poisonous or deleterious ingredient, provided two things hold. The label carries the set caution statement, and the product comes with adequate directions for a skin test before dyeing. That caution warns of ingredients which may cause skin irritation in some people, says a preliminary test should be made first, and says the product must not go on eyelashes or eyebrows. FDA names paraphenylenediamine, PPD, as the ingredient implicated most prominently in allergic reactions.

What follows for the app is a field, not a feature: a date, the product, the result and who recorded it. Show it on the booking screen the moment somebody books a colour service. Whether your insurer or your state board requires you to hold that record is a separate question. We have not verified any specific requirement, so confirm it with them rather than assuming the app satisfies one.

Photos belong beside the formula, and they are the most sensitive thing in the record. Decide once whether they leave the phone, where they are stored and for how long. That decision is much harder to change after two years of before and after shots.

FDA, hair dyes and the coal-tar caution statement

Deposits, and what Apple actually allows

A deposit is what makes a Saturday appointment mean something. It is also where people expect trouble, because they have heard that Apple takes a cut of purchases made inside an app. For salon work the rule points the other way.

App Store Review Guideline 3.1.3(e) covers goods and services consumed outside the app. If your app lets people buy physical goods or real world services that will be consumed outside it, that payment has to be collected by a method other than in-app purchase. Apple Pay or ordinary card entry are the examples Apple gives. A haircut happens in your chair, not on the phone. So a deposit on it is not merely allowed outside in-app purchase, it has to be outside it. Google Play's payments policy carves out purchases of physical services in the same way.

That settles the platform question and leaves the design one. Three patterns, in rising order of friction. A card kept on file with your processor and charged only if the client does not show. A real deposit taken at booking and deducted from the bill. Prepaid packages, which is the point where scheduling turns into a membership management app. The card on file is the lightest and does most of the work, because it changes behaviour without asking anyone to pay twice.

Whichever you choose, put the cancellation rule in the app in the words the client agreed to at booking, with the window in hours and the amount in money. A fee your front desk has to explain from memory is a fee nobody ever charges.

Apple, App Store Review Guidelines 3.1.3(e), goods and services outside of the app

A cancellation is a gap, and the gap is the money

A no-show costs the whole slot. A cancellation two days out costs nothing at all, provided somebody fills it. That difference is why the most valuable screen in a hair salon appointment app is not the calendar, it is the waitlist.

Two mechanics do the work. Reminders, which remove the clients who simply forgot. And a waitlist that knows who wanted Saturday and can offer a freed slot in a defined order. Reminders are the whole job of an appointment reminder app, and they are worth building first. They are the cheapest change with the largest effect on an empty chair.

Write the offer rule down before you build the screen. Who hears about the gap first, the client who asked for that exact time or everybody waiting? How long do they get to accept before it moves on? Does a gap inside two hours go to the waitlist at all, or straight to the front desk to phone somebody? Those answers are what make a waitlist useful instead of noisy.

One thing to settle before the schedule leans on notifications. A push reaches only a client who installed the app and agreed to receive them, and neither is guaranteed. Somebody who books through a link in an Instagram bio has done neither. Plan a fallback channel, and read the reminder that stops a no-show before you design around messages you may not be able to deliver.

What each option gives a salon

Building one around your own chairs

Salon platforms are priced per stylist or per chair each month and shaped around the average salon. That is fine until your salon is not average. A colourist who works Tuesdays and Thursdays only. An assistant who shampoos, so two columns share one pair of hands. A chair rented to a self employed stylist who keeps her own book and her own prices.

The app that fits a salon like that is not large, it is specific. Services with three durations. Resources that can be held separately. A client record with the formula and the allergy note. A card on file, a reminder and a waitlist. None of that needs a platform rebuilt around you.

Newly is an AI app builder. You describe the salon, including the way your services really break into blocks, and it writes a real React Native and Expo project you own. It runs on a cloud iPhone or Android simulator while it builds. It is $25 a month and there is no free plan. iOS ships through TestFlight and App Store Connect with your own Apple Developer account. On Android it publishes to Google Play internal testing from the Deploy tab, and it also builds a standalone production APK with the JavaScript bundled in. Payments are not built in, so a deposit or a card on file runs through a processor you add yourself.

Start with whatever costs you money this month. For most salons that is the Saturday gap rather than the calendar view, and the app that fills the gap is allowed to be ugly for a while.

Questions people ask about salon booking apps

Describe the way your salon really books

Write down one colour service as three blocks, the resources each block needs and what the cancellation rule is, then build the schedule around those instead of around a month grid.