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ffsubsync vs Gaupol: catalog facts
ffsubsync	Gaupol
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux, Command line	Linux
Automatic alignment without manual offsets Works from the command line	Supports multiple text subtitle formats Tools for translating subtitles
Requires Python and ffmpeg Cannot fix subtitles whose text does not match the audio	Text-based subtitles only, no image subtitles Mainly aimed at Linux desktops
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License not stated
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.