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ffsubsync vs Subtitle Composer: catalog facts
ffsubsync	Subtitle Composer
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux, Command line	Windows, Linux
Automatic alignment without manual offsets Works from the command line	Waveform view for precise timing Two subtitles side by side for translation
Requires Python and ffmpeg Cannot fix subtitles whose text does not match the audio	No macOS build listed Handles text-based subtitles only
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 24, 2026

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