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Drift vs SoundAura: catalog facts
Drift	SoundAura
Free Free and open source, with no ads.	Free Free and open source under the Apache 2.0 licence.
Android	Android
Independent volume for each sound layer Sleep timer that fades audio out	Plays many tracks at once with individual volume Small download since no sounds are bundled
Android only Limited to the bundled sound library	No built-in sounds; you must supply your own files Android only
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: Apache-2.0
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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