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Subtitle Composer vs Gaupol: catalog facts
Subtitle Composer	Gaupol
Free Free and open source.	Free Free and open source.
Windows, Linux	Linux
Waveform view for precise timing Two subtitles side by side for translation	Supports multiple text subtitle formats Tools for translating subtitles
No macOS build listed Handles text-based subtitles only	Text-based subtitles only, no image subtitles Mainly aimed at Linux desktops
Downloadable app	Downloadable app
Open source	Open source
License not stated	License not stated
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.