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Sleep as Android vs Plees Tracker: catalog facts
Sleep as Android	Plees Tracker
Freemium Free to try, with paid features unlocked by purchase.	Free Free and open source under the MIT license.
Android	Android
Smart alarm based on sleep phase tracking Works with phone sensors or wearables	No battery drain while you sleep Stores past sleeps and shows the daily average
Android only Large feature set can take time to configure	Manual start and stop only, no sensor-based sleep analysis Android only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.