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Fladder vs Tsukimi: catalog facts
Fladder	Tsukimi
Free Free and open source under the GPL-3.0.	Free Free and open source under GPL-3.0.
Linux	Windows, Linux
Dedicated app for Jellyfin libraries Single Flutter codebase aimed at several platforms	Native desktop Jellyfin client mpv playback with gpu-next output
Requires a Jellyfin server to be useful Little documentation in the research about features	Requires a Jellyfin server Primarily targets Linux
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0
Account needed	Account needed
Not stated if it works offline	Needs internet
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.