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Subtitle Composer vs Aegisub (arch1t3cht fork): catalog facts
Subtitle Composer	Aegisub (arch1t3cht fork)
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	Actively maintained continuation of Aegisub Extra features merged from feature branches
No macOS build listed Handles text-based subtitles only	Feature details are spread across the README and release notes Mixed licensing across components
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: BSD-3-Clause, MIT and others
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 2, 2026

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