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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.
Con Still in beta
Can be subjects to unstable behaviors depending on the system version you have.