When comparing App Usage vs Space, 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 Space is ranked 2nd.
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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 Ability to pause or focus
At any moment you can pause the tracking of your activity from the app by pressing the pause button. A reminder is set an hour later in case you forgot to remove the pause. The focus feature is almost the same except all phone notifications will be blocked.
Pro Adaptive profiles
The app will set objectives and give advice depending on the type of addiction you have. The 4 profiles you can choose from are Rabbit-hole Wanderer, Social Sticky Mitt, Boredom Battler and Busy Bee.
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 Poor Content
I don't know if the 7 days detox course and the ability to compare your statistics with the world worth €3.99, even after buying it.