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Syncplay vs Multiplex: catalog facts
Syncplay	Multiplex
Free The open-source software is available without a license fee. Hosting, hardware and…	Free Free and open source under the AGPL-3.0 licence.
Windows, macOS, Linux	Linux
Shares pause, seek and playback positions between compatible players.	Streams torrents without waiting for a full download Synchronised playback for watch parties
Each participant needs access to the media and a supported player.	Linux only Everyone needs the app to join a session
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: AGPL-3.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Needs internet
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.