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Noise Timer vs Sleep Noise: catalog facts
Noise Timer	Sleep Noise
Free Free and open source under the MIT license.	Free Free and open source under the MIT license.
Android	Android
Generates noise in real time rather than looping recordings Offers preset and custom sleep timers	Generates four types of background noise on the device Includes a sleep timer with gradual fade-out
Android only	Android only The interface has no light mode
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
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 8, 2026

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