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Sleep Noise vs Chroma Doze: catalog facts
Sleep Noise	Chroma Doze
Free Free and open source under the MIT license.	Free Free and open source under the GPL-3.0 licence.
Android	Android
Generates four types of background noise on the device Includes a sleep timer with gradual fade-out	Draw any noise spectrum by hand Fast feedback while adjusting
Android only The interface has no light mode	Android only Infrequent updates
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-only
No account needed	No account needed
Works offline	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.