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Aegisub (arch1t3cht fork) vs Subtitle Composer: catalog facts
Aegisub (arch1t3cht fork)	Subtitle Composer
Free Free and open source.	Free Free and open source.
Windows, macOS, Linux	Windows, Linux
Actively maintained continuation of Aegisub Extra features merged from feature branches	Waveform view for precise timing Two subtitles side by side for translation
Feature details are spread across the README and release notes Mixed licensing across components	No macOS build listed Handles text-based subtitles only
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause, MIT and others	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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