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Pzizz vs Drift: catalog facts
Pzizz	Drift
Freemium A free version is available, with a paid full version.	Free Free and open source, with no ads.
Android	Android
Separate modes for night sleep and short naps Combines soundscapes with voice cues	Independent volume for each sound layer Sleep timer that fades audio out
Full features need a purchase Not a sleep tracker; it does not measure sleep	Android only Limited to the bundled sound library
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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