Clever Rent is a mobile application that you can rent everything (hotel rooms, cars etc.) or make appointments for everything (doctors, hairdressers, clinics etc.). It gives you to define your rental (or appointment owners like doctors) objects and see their transactions in a calendar like views. It holds the data on a remote server and you can connect to it via an active internet connection. So the data is always up to date and does not need any synchronization between devices. Entire app written in nearly 6 months.