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Gaupol vs Subtitle Composer: catalog facts
Gaupol	Subtitle Composer
Free Free and open source.	Free Free and open source.
Linux	Windows, Linux
Supports multiple text subtitle formats Tools for translating subtitles	Waveform view for precise timing Two subtitles side by side for translation
Text-based subtitles only, no image subtitles Mainly aimed at Linux desktops	No macOS build listed Handles text-based subtitles only
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 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.