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Pzizz vs Calm: catalog facts
Pzizz	Calm
Freemium A free version is available, with a paid full version.	Freemium Can be tried for free, with the full library in a paid subscription.
Android	Android, iOS
Separate modes for night sleep and short naps Combines soundscapes with voice cues	Large library of guided meditations and sleep content Soundscapes for relaxing or falling asleep
Full features need a purchase Not a sleep tracker; it does not measure sleep	Much of the content requires a paid subscription Proprietary service that needs an account
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account 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.