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