You're able to choose between different modes which will be explained below.
With the time picker it is easy to pick a time in the future. Imagine it's like 14:00 and you want to go studying for like 2 hours then you just set the time picker on 16:00 and of you go!
After you hit start. All incoming notifications will be blocked. You can still use your phone the normal way but if you put your phone in your pocket or just put it away it won't ring and the screen will not light up. Now u can fully concentrate on your work.
Hit start and you're all set! All incoming notifications will be blocked until you hit stop.
The technique uses a timer to break down work into intervals, traditionally 25 minutes in length, separated by short breaks. These intervals are named pomodoros, the plural in English of the Italian word pomodoro (tomato). The intervals, breaks and the amount of sessions are fully customizable.
Unfortunately the app wont be coming to IOS anytime soon. This has everything to do with the fact that the costs of producing a app for IOS is about $3000
(buying a macbook, Learning swift, Get a developer account).