Use pre-determined time buckets to see progressive drop-offs, segmented by as many properties as needed.
Combine with User Profiles to segment user bases, identify what might have gone wrong, and get them back.
This feature reports the number and percentage of users who didn't have a session in your application for more than 7, 14, 30, 60, and 90 days in buckets.
With Countly Enterprise Edition, you can also display individual users in each bucket using User Profiles to better map the customer journey and come up with better retention strategies.