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Riff vs Moosync: catalog facts
Riff	Moosync
Free Free and open source under the MIT licence; a Spotify account is needed to stream.	Free Free and open source under the GPL-3.0-or-later licence.
Linux	Linux
Native GTK interface that fits the GNOME desktop Written in Rust rather than built on Electron	Plays Spotify and YouTube tracks alongside local music Theme engine and extension API
Requires a Spotify account Unofficial client, so it depends on Spotify's services continuing to work with it	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
Account needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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