Every customer has a card: contact, visits, service amount. This is not a list in your phone — it is a database you use later when you offer a renewal or a campaign.
When the client calls a second time, you do not hunt for the number in chat. You open the card: phone, email, a note, what they did last time. Visit history sits on the customer, not in a separate file.
The service amount stays with the booking, so you see both what was done and what it cost. That same list is later for marketing: you know who to remind about a renewal, and who to offer the same service before they go elsewhere.
Every free and booked slot in one place.
Send SMS and email notifications about appointments.
Clients pick a slot and book themselves on the website.
SMS before a yearly or half-year service expires.
Duration, service amount and renewal interval on each item.
Contracts, proformas and invoices with booking.
Working days, holidays and teams — slots follow your hours.