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Kaset vs Moosync: catalog facts
Kaset	Moosync
Free Free and open source under the MIT license.	Free Free and open source under the GPL-3.0-or-later licence.
macOS	Linux
Combines YouTube and YouTube Music in a Mac app Uses a native macOS interface	Plays Spotify and YouTube tracks alongside local music Theme engine and extension API
Available for macOS	Streaming features depend on third-party services Small community
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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