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