Why dual subtitles help
YouTube dual subtitles extension
One subtitle line often is not enough: original captions help listening and reading, while translated captions keep the meaning clear.
YouTube dual subtitles extension
Watch YouTube with original and translated subtitles together.
SubLex adds a clean dual-subtitle layer to YouTube so language learners can follow real videos without switching tabs every few seconds.
What SubLex adds
Watch → Understand → Save → Practice
SubLex keeps the learning loop close to the YouTube video, then moves saved vocabulary into your personal dictionary and cards.
How the workflow feels
Original + translation
See the source caption and translation at the same time on YouTube.
Readable settings
Adjust language, font size, and subtitle background from the popup.
Vocabulary workflow
Go beyond comprehension by saving words and practicing them later.
FAQ
Before you install
Does SubLex work on all YouTube videos?
It works well on videos that have YouTube captions available.
Can I choose the translation language?
Yes. Choose the translation language from the extension popup.
Is SubLex only a subtitle tool?
No. It also helps you save words from subtitles and review vocabulary cards.