Hairdresser appointment making app

I need an app for a hairdresser, please see BarberApp. The app only has to allow to make appointments for clients to come to the hairdresser, possibly the back end needs to be connected to our Google Calendar (from which appointments are managed). Needs to be on the GooglePlay store (and let me know how much for it to be on AppleStore too, but not 100% neccessery)