When comparing App Usage vs (OFFTIME), the Slant community recommends App Usage for most people. In the question“What are the best app usage tracking apps on Android?” App Usage is ranked 1st while (OFFTIME) is ranked 3rd.
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Pros
Pro You can also track phone usage and the number of times you unlock your phone
Pro Provides different views for the statistics
Pro Free version's ads are not intrusive and don't pop-up
Pro Allows you to choose the apps to track or ignore
Pro Highly customizable persistent notifications
There is a load of information you can display in persistent notifications, from global phone usage, a remaining time notification for each app and even a most used apps notification you can use to switch app.
Pro (OFFTIME) sessions
You can plan to lock your phone activities for a defined period of time. During a session you can't open any app, phone calls are blocked and notifications are delayed until the end of the session. You can also whitelist some apps and some contacts.
Pro Detailed tracking of phone usage
Tracks app usage data like opening count and duration but also tracks social interactions like call duration and message count by contact.
Cons
Con The pro version is rather costly
Con Not open source
Con Sometimes loses database
Database (history) sometimes gets lost, either by corrupted database or simply emptying it.
Con Still in beta
Can be subjects to unstable behaviors depending on the system version you have.