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Subtitle Composer vs Aegisub: catalog facts
Subtitle Composer	Aegisub
Free Free and open source.	Free Free and open source.
Windows, Linux	Windows, macOS, Linux
Waveform view for precise timing Two subtitles side by side for translation	Precise timing of subtitles to audio Detailed styling tools
No macOS build listed Handles text-based subtitles only	Interface takes time to learn Focused on subtitles, not general video editing
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: BSD
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 September 23, 2026

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