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Jubler vs alass: catalog facts
Jubler	alass
Free Free and open source under the AGPL-3.0, funded by donations.	Free Free and open source under the GPL-3.0-or-later license.
Windows, macOS, Linux, Command line	Windows, Linux, Command line
Supports more than 20 subtitle formats Video preview, waveform and draggable timeline	Corrects subtitle offsets, cuts, and frame-rate differences Can align subtitles in different languages
Text-based subtitles only Translation mode relies on Azure Translator	Command-line interface Linux use requires FFmpeg and ffprobe
Downloadable app	Downloadable app
Open source	Open source
License: AGPL-3.0	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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