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

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