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Sleep Cycle vs Plees Tracker: catalog facts
Sleep Cycle	Plees Tracker
Freemium Free to download, with premium features offered through a subscription after a free trial.	Free Free and open source under the MIT license.
Android, iOS	Android
Sleep tracking with only a phone Smart alarm that wakes you in lighter sleep	No battery drain while you sleep Stores past sleeps and shows the daily average
Main features are pushed toward a paid subscription Sound-based tracking is an estimate	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.