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ffsubsync vs Aegisub: catalog facts
ffsubsync	Aegisub
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, macOS, Linux
Automatic alignment without manual offsets Works from the command line	Precise timing of subtitles to audio Detailed styling tools
Requires Python and ffmpeg Cannot fix subtitles whose text does not match the audio	Interface takes time to learn Focused on subtitles, not general video editing
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: BSD
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.