Choose Trancy
You want one product across more learning surfaces
Its webpage and PDF translation, broader video support, speaking tools, exercises, and mobile app make it the more complete suite.
Chrome extensions · Video-based language learning
Dubstack or Trancy?
Trancy follows you across videos, webpages, PDFs, speaking practice, and mobile. Dubstack stays with Netflix and YouTube.
Comparison checked July 12, 2026.
The short answer
Choose breadth or restraint.
Trancy is a strong fit when video is one part of a larger translation and study workflow. Dubstack is for the learner who wants a smaller interface, fewer permissions, and a predictable Netflix and YouTube habit.
Side by side
A focused extension beside a broader learning suite.
Swipe the table to compare both extensions.
| Area | Dubstack | Trancy |
|---|---|---|
| Product shape | Dual subtitles and lookup for two video sites | Video, webpage, PDF, vocabulary, speaking, and pronunciation suite |
| Video sites | Netflix and YouTube | YouTube, Netflix, HBO, Disney+, TED, Coursera, Udemy, and more |
| Free dual subtitles | Included | Included |
| Lookup | Word and drag-selected phrase, with the current subtitle kept in view | Unlimited word and sentence translation, plus AI definitions in paid tiers |
| Saved vocabulary | Saved lines with context and CSV or Anki export on free plan | 100 words and 50 sentences on free plan; broader wordbook tools in Premium |
| AI tools | Concise grammar, idiom, and tone explanations in Premium | Transcription, grammar analysis, summaries, speaking coach, and multiple AI engines |
| Beyond the browser | No mobile app or cloud study center | Mobile app and cross-platform learning tools |
| Price shape | Free core; $4 monthly or $29 yearly Premium | Free, Premium, and advanced AI plans |
Trancy details come from its pricing and feature table and Chrome Web Store listing.
Choose Dubstack
You want fewer moving parts while watching
Its free plan requires no account, stays focused on Netflix and YouTube, and keeps phrase lookup, replay, blur, saving, and export close to the player.
The trade
Dubstack does not follow you around the web.
That means no full-page translation, PDF tools, or speaking coach. It also means Dubstack does not request access to every website. Its host permissions are limited to Netflix, YouTube, and Netflix subtitle files.
For a learner who wants a broad toolkit, that limitation is a reason to pick Trancy. For someone cautious about extension scope, it can be the reason to pick Dubstack.