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Fladder vs Plezy: catalog facts
Fladder	Plezy
Free Free and open source under the GPL-3.0.	Free Open source under the GPL 3.0; downloads are offered free on the website.
Linux	Windows, macOS, Linux, Android, iOS
Dedicated app for Jellyfin libraries Single Flutter codebase aimed at several platforms	Works with both Plex and Jellyfin servers Wide direct-play codec support with HDR10+ and Dolby Vision
Requires a Jellyfin server to be useful Little documentation in the research about features	Needs an existing Plex or Jellyfin server Third-party client, so new server features may lag behind official apps
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-only	License: GPL-3.0-only
Account needed	Not stated if an account is 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.