Dual subtitles on Netflix and YouTube
Pick the language you are learning and keep your native language underneath. Dubstack keeps the overlay compact and stable.
Dual subtitles for focused watching
Understand the line without leaving the scene.
Dubstack adds a clean second subtitle line, instant word lookup, replay, saved words, and short AI explanations when a phrase needs context.
preocupes
do not worry, casual reassurance
No te preocupes por nada de eso
Do not worry about any of that
Two lines
native and learning subtitles stay readable together.
One click
inspect words or phrases without breaking flow.
No account wall
core features work locally in your browser.
Product
A focused subtitle layer for real watching.
Lookup that stays in the video
Click a word, drag a phrase, save it with the exact subtitle sentence, then keep watching.
Replay, blur, save, export
Replay the current line, hide translations until hover, and export saved items to CSV or Anki.
Privacy
Free features stay on your device.
Settings, saved words, and local lookups stay in Chrome extension storage. Premium sends only the selected phrase, the surrounding subtitle line, language codes, and entitlement data needed to answer the request.
FAQ
Plain answers before install.
Is Dubstack affiliated with Netflix or YouTube?
No. Dubstack is independent and is not affiliated with Netflix, YouTube, or Google.
What does Premium send to the server?
The selected phrase, the subtitle line around it, language codes, and entitlement data. It does not send browsing history or full pages.
How do I cancel?
Premium subscriptions are managed through the billing portal. Free features keep working after cancellation.
Which browsers are supported?
The launch build targets desktop Chrome-compatible browsers.