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Pillow vs SleepWatch: catalog facts
Pillow	SleepWatch
Freemium Free on the App Store with optional paid features.	Freemium Free to use, with a Premium subscription for extra features.
iOS	Android, iOS
Works on Apple Watch, iPhone and iPad Records sleep audio such as snoring	Uses Apple Watch heart rate, HRV and blood oxygen data Activity tagging to link habits with sleep quality
Apple devices only Some features need payment	Richest data depends on owning an Apple Watch Some features require Premium
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	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 September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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