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

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