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Sleep Noise vs Whisper Noise: catalog facts
Sleep Noise	Whisper Noise
Free Free and open source under the MIT license.	Free Free and open source under the MIT licence.
Android	Android
Generates four types of background noise on the device Includes a sleep timer with gradual fade-out	Several noise types, including white and brown noise No ads or paywall
Android only The interface has no light mode	Very new project with a short track record Android only
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
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 8, 2026	Official website Full listing and sources Checked October 2, 2026

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