Nightmare Worst UI, lots of bugs, advertisement covering the whole screen, App render's poorly in my phone. Its like a Nightmare come true for software developers.
Good app The app runs in the background without any power drain. Added feature productivity grade keeps you alert.
Good App, but... On my Galaxy Note 4, there is no menu option since there is no longer a menu soft key. Cannot change settings.
Crap ui This app is not useful. Spammy.
Pomodoro Tracker is better This app is good, but doesn't display the minutes remaining in the notifications bar like Pomodoro Tracker does. PT allows more customization.
The best Tried most of the others. This is my favorite.