Four taps: service, who, day, time. Only genuinely free slots are ever offered, built from that staff member's shifts, their leave, the bookings already in the diary and the buffer after each job. "Anyone available" merges the whole team's diaries into one clean list. Take a deposit if you want one, and send a reminder before they turn up. No account needed to book. Most people booking a haircut will never make one — they get a reference and a link instead. Prices are snapshotted onto the booking, so putting your rates up next month never rewrites what last month's customer owed. Nothing with history is deleted. Retiring a service or a staff member hides them from new bookings and leaves the past intact.