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Aegisub vs Subtitle Composer: catalog facts
Aegisub	Subtitle Composer
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux	Windows, Linux
Precise timing of subtitles to audio Detailed styling tools	Waveform view for precise timing Two subtitles side by side for translation
Interface takes time to learn Focused on subtitles, not general video editing	No macOS build listed Handles text-based subtitles only
Downloadable app	Downloadable app
Open source	Open source
License: BSD	License not stated
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 September 24, 2026

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