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Moosync vs Nuclear: catalog facts
Moosync	Nuclear
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the AGPL-3.0 licence.
Linux	Windows, macOS, Linux
Plays Spotify and YouTube tracks alongside local music Theme engine and extension API	Streams from multiple sources, extendable with plugins Playlist import from other services and JSON files
Streaming features depend on third-party services Small community	Desktop only, no mobile app macOS may block the app on first launch
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: AGPL-3.0-only
No account needed	Not stated if an account is needed
Not stated if it works offline	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.