Best tools · 2026 guide
Two subtitle lines are only the start. We compared what each extension lets you do with a sentence after you understand it.
Researched August 16, 2026. Ranked by use case, not sponsorship.
Shortlist
A dual subtitle extension shows original and translated captions together. For language learning, the deciding features are sentence replay, word lookup, saved context, speaking practice, platform support and whether the translation can stay out of the way.
| # | Tool | Best for | Main trade-off |
|---|---|---|---|
| 1 | NoaLingua | for active learning after dual subtitles | Direct platform support is narrower than Trancy; desktop Chrome only. |
| 2 | Language Reactor | established YouTube/Netflix choice | Officially does not support Disney+ or Amazon Prime and reserves key actions for Pro. |
| 3 | Trancy | for many streaming and course sites | Connected AI features and higher allowances are paid-tier concerns. |
| 4 | Migaku | for mining rich flashcards | More setup and cost than a simple subtitle overlay. |
| 5 | eJOY | English-focused captions and games | The wider suite is optimized primarily around English learning. |
| 6 | Immersive Translate | translation-first subtitle tool | Not primarily a sentence-mining or speaking-practice system. |
NoaSolutions makes NoaLingua. We include our product where it is relevant, link to each competitor's official source, avoid affiliate rankings, and publish disadvantages as well as strengths.
Method
The picks
Best for active learning after dual subtitles
Adds sentence controls, contextual grammar, transcripts, shadowing, Say It Back and 30 review activities to the subtitle layer.
Trade-off: Direct platform support is narrower than Trancy; desktop Chrome only.
Check NoaLingua's Chrome Web Store listingBest established YouTube/Netflix choice
A mature subtitle and dictionary experience with familiar controls and a large installed base.
Trade-off: Officially does not support Disney+ or Amazon Prime and reserves key actions for Pro.
Check Language Reactor's official FAQBest for many streaming and course sites
Officially lists a broad platform set, bilingual subtitles, subtitle downloads and AI segmentation.
Trade-off: Connected AI features and higher allowances are paid-tier concerns.
Check Trancy's official pricing and featuresBest for mining rich flashcards
Supported streaming sites feed a serious card and review ecosystem across desktop and mobile.
Trade-off: More setup and cost than a simple subtitle overlay.
Check Migaku's official getting-started FAQBest English-focused captions and games
Dual or multi-layer subtitles, AI dictionary, vocabulary saving and learning games work together.
Trade-off: The wider suite is optimized primarily around English learning.
Check eJOY's official product pageBest translation-first subtitle tool
Strong bilingual translation across online video and a much broader translation toolkit.
Trade-off: Not primarily a sentence-mining or speaking-practice system.
Check Immersive Translate's official product and pricing pageHow to choose
If you mainly watch YouTube and Netflix, compare the controls and word popup in NoaLingua and Language Reactor. If named platform coverage is the priority, Trancy and Migaku deserve the first test. If English exercises matter, eJOY is strong. If video is only one part of a general translation need, Immersive Translate is the more natural fit.
Questions answered
Yes. These extensions can add a translated line beside the original caption, subject to the video having captions or the tool offering a separate transcription path.
Both extensions may try to hide the site caption layer and draw their own overlay. Disable one extension on that site and reload the page.
NoaLingua is designed without a product account. Its learning data is stored locally in the Chrome profile by default.
Primary sources
Every feature is available free; the limit is how many words stay in the local deck.
