When comparing Zazen Meditation Timer vs Strive Uptime, the Slant community recommends Zazen Meditation Timer for most people. In the question“What are the best meditation timer apps for Android?” Zazen Meditation Timer is ranked 2nd while Strive Uptime is ranked 9th. The most important reason people chose Zazen Meditation Timer is:
The app is free to download and does not feature advertisements or in-app purchases.
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Pros
Pro Completely free to use
The app is free to download and does not feature advertisements or in-app purchases.
Pro Support for custom bell sounds
Zazen Meditation Timer allows you to use your own bell chimes or other sounds as a timer to remind you of the end of a meditation session.
Pro Detailed interval programming
The Zazen Medition Timer allows extensive options for interval programming within meditation sessions. For example, you can let a bell sound every three minutes or so.

Pro Do Not Disturb mode
Can automatically enable DND mode during timer.

Pro Pause button
Timer can be paused and resumed without stopping it completely.

Pro Configurable timer
Pro Easy to use
Cons
Con Doesn't dim the screen
When using the app, the screen of your device isn't dimmed. This results in a higher battery drainage.
Con Doesn't block all notifications
The app doesn't block all notifications on your phone, which can be distracting in the midst of a meditation session.

Con Not a Pomodoro app
There are no break or long break timers
