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Plees Tracker vs Sleep Cycle: catalog facts
Plees Tracker	Sleep Cycle
Free Free and open source under the MIT license.	Freemium Free to download, with premium features offered through a subscription after a free trial.
Android	Android, iOS
No battery drain while you sleep Stores past sleeps and shows the daily average	Sleep tracking with only a phone Smart alarm that wakes you in lighter sleep
Manual start and stop only, no sensor-based sleep analysis Android only	Main features are pushed toward a paid subscription Sound-based tracking is an estimate
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
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 October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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