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You can pause and resume the app, which is great because you can pause it and come back it it when something pops up instead of abandoning it.
Pro Configurable work/break intervals
You can even configure your break intervals so that every few short breaks you get a longer break.
Pro Black theme available
Especially on Amoled screens, the dark theme looks great and saves battery life.
Pro Continuous mode
You can set it to start one timer after another until you manually stop it.
Pro Supports 25 languages
Pro Worked under old version of Android
Worked well on my ancient Google Nexus 7 tablet still running Android 4.4.
Con Using system sounds is a unstable feature
This feature is currently in Beta and may not work on some devices, possibly restricting you to the app's limited selection of sounds.
Con Statistics can to be improved
Con Buggy timer
When in full screen timer mode and switching from portrait to landscape view or the other way round, the timer will sometimes jump to 0, which really gets on your nerves after some time.
Advertising in the free version.
Con Faulty statistics
The calculation of the total time spent working does not work correctly, e.g. the statistics show 4:10 hours for a total of 6 x 50 minutes sessions, which should result in 5:00 hours.