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Nuclear vs Moosync: catalog facts
Nuclear	Moosync
Free Free and open source under the AGPL-3.0 licence.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, macOS, Linux	Linux
Streams from multiple sources, extendable with plugins Playlist import from other services and JSON files	Plays Spotify and YouTube tracks alongside local music Theme engine and extension API
Desktop only, no mobile app macOS may block the app on first launch	Streaming features depend on third-party services Small community
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0-only	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 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.