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Submariner vs Gelly: catalog facts
Submariner	Gelly
Free Free and open source under the 3-clause BSD license.	Free Free and open source under the GPL-3.0-or-later.
macOS	Linux, Command line
Native Mac interface, not Electron Works with Subsonic and compatible servers	Supports both Jellyfin and Subsonic servers Gapless playback and ReplayGain
macOS only Needs a Subsonic-compatible server to be useful	Needs your own Jellyfin or Subsonic-compatible server Linux only
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	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 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.