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Jubler vs ffsubsync: catalog facts
Jubler	ffsubsync
Free Free and open source under the AGPL-3.0, funded by donations.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux, Command line
Supports more than 20 subtitle formats Video preview, waveform and draggable timeline	Automatic alignment without manual offsets Works from the command line
Text-based subtitles only Translation mode relies on Azure Translator	Requires Python and ffmpeg Cannot fix subtitles whose text does not match the audio
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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