Compare software

Subtitle Composer vs ffsubsync: catalog facts
Subtitle Composer	ffsubsync
Free Free and open source.	Free Free and open source.
Windows, Linux	Windows, macOS, Linux, Command line
Waveform view for precise timing Two subtitles side by side for translation	Automatic alignment without manual offsets Works from the command line
No macOS build listed Handles text-based subtitles only	Requires Python and ffmpeg Cannot fix subtitles whose text does not match the audio
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked October 1, 2026

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