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Gelly vs Coppelia: catalog facts
Gelly	Coppelia
Free Free and open source under the GPL-3.0-or-later.	Free Free and open source under the Apache 2.0 licence.
Linux, Command line	macOS, Linux, Android
Supports both Jellyfin and Subsonic servers Gapless playback and ReplayGain	Offline pinning with download and cache controls Smart lists built from listening rules
Needs your own Jellyfin or Subsonic-compatible server Linux only	Requires a Jellyfin server iOS download offered only as a simulator build
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: Apache-2.0
Account needed	Account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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