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

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