A free app for Android, by Square Inc..

Square Appointments: Booking Scheduling Payments is an all-in-one solution for businesses of any size. It’s the easiest way to manage your business on the go, from anywhere in the world.

With Square Appointments, you can:

Book 24/7 – Booking that’s easy for you and your customers, all in one place. Manage & track your clients, including their history, so you’ll never lose a client. Accept payments, sell products, and send invoices. Track payments, view receipts, and get reminders when customers are due for their next appointment.

Sell products, services, and more – Square Appointments is a point of sale, where customers can pay you in exchange for your product or service. It’s a powerful way to turn your business into a store where customers can pay you to buy products from you.