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Supersonic vs Gelly: catalog facts
Supersonic	Gelly
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free and open source under the GPL-3.0-or-later.
Windows, macOS, Linux	Linux, Command line
Provides a native desktop interface with gapless playback.	Supports both Jellyfin and Subsonic servers Gapless playback and ReplayGain
Requires access to a supported music server.	Needs your own Jellyfin or Subsonic-compatible server Linux only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
Not stated if an account is needed	Account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked October 1, 2026

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