Best Language Learning Chrome Extensions in 2026
Most roundups rank by feature count, which rewards whoever ships the most checkboxes. This one ranks by a narrower question: after installing it, will you actually practise the language, or just read a translation? Below are 10 extensions that turn what you already watch and read into practice, with the trade-offs stated plainly.
Quick answer: pick by what you watch
If you watch YouTube or Bilibili and want speaking drills (dictation, shadowing, cloze) plus spaced repetition, start with LangKey. If you mostly watch Netflix on Chrome, Language Reactor is still the most mature dual-subtitle layer. If you live in Anki and want to mine cards from video, asbplayer is hard to beat. If you only need page translation while reading news, Immersive Translate is the lightest option.
| Tool | Best for | Platforms | Price | Limitation |
|---|---|---|---|---|
| LangKey | Turning video into actual practice | Chrome, Edge, Firefox | Free tier, Pro optional | Younger ecosystem than the incumbents, so fewer third-party integrations and a smaller community to borrow workflows from. |
| Language Reactor | Netflix and YouTube dual subtitles | Chrome-based browsers | Free tier, Pro subscription | Chrome-based browsers only, and the features most people want (full phrase saving, some Netflix controls) sit behind the Pro paywall. |
| Trancy | Bilingual subtitles plus AI explanation | Chrome, Edge | Free tier, subscription for AI | The AI features that differentiate it are metered, and the interface packs a lot of panels that take time to learn. |
| Migaku | A full immersion stack with Anki sync | Chrome, desktop apps | Subscription | Steepest learning curve on this list and a subscription is required for most of the value; configuring it is a project in itself. |
| Immersive Translate | Reading foreign-language pages | Chrome, Edge, Firefox, mobile | Free tier, Pro optional | Translation-first by design: it removes the friction of not understanding, which is exactly why it produces very little speaking or recall practice. |
| asbplayer | Mining Anki cards from video | Chrome, Firefox | Free, open source | Built for local files: streaming sites generally need a separate download step, and there is no structured practice beyond card creation. |
| LingQ | Reading and listening volume tracking | Web, mobile, Chrome extension | Free tier, subscription | Library-centric rather than video-centric, and the vocabulary system only pays off if you import or consume content inside its ecosystem. |
| Lingopie | Learning from TV series | Web, TV apps, Chrome extension | Subscription | Catalogue varies by region and is limited to what the service licenses, so your favourite show is often not available. |
| Readlang | Reading articles with inline translation | Web, Chrome extension | Free tier, subscription for AI | Reading only — no listening or speaking component, so comprehension grows faster than output. |
| Substital | Quick dual subtitles on streaming sites | Chrome, Firefox | Free | It is a subtitle layer, not a study system: no review queue, so words you looked up are gone the next day. |
The tools, reviewed
LangKey — Turning video into actual practice
Built around practice rather than translation: dual subtitles, dictation, shadowing, cloze fill-in, AI conversation and an SM-2 spaced repetition queue that auto-collects the words you miss. Open source, works on video and articles.
Where it falls short: Younger ecosystem than the incumbents, so fewer third-party integrations and a smaller community to borrow workflows from.
Language Reactor — Netflix and YouTube dual subtitles
The reference implementation of bilingual subtitles, with per-word popups, phrase saving and a large shared phrase database. Arguably the default choice for Netflix learners.
Where it falls short: Chrome-based browsers only, and the features most people want (full phrase saving, some Netflix controls) sit behind the Pro paywall.
Trancy — Bilingual subtitles plus AI explanation
Dual subtitles with AI grammar and word explanation, plus a reading mode for web pages. Covers a wide set of streaming sites.
Where it falls short: The AI features that differentiate it are metered, and the interface packs a lot of panels that take time to learn.
Migaku — A full immersion stack with Anki sync
Extension plus desktop apps plus Anki integration: dictionary lookups, card creation from subtitles, and a curated learning path. Depth is its selling point.
Where it falls short: Steepest learning curve on this list and a subscription is required for most of the value; configuring it is a project in itself.
Immersive Translate — Reading foreign-language pages
Bilingual rendering for web pages, PDFs and video subtitles, with many translation engines to choose from. Very low setup cost.
Where it falls short: Translation-first by design: it removes the friction of not understanding, which is exactly why it produces very little speaking or recall practice.
asbplayer — Mining Anki cards from video
Open-source subtitle player that syncs local video files with Anki, so a single keystroke creates a card with the exact audio and screenshot.
Where it falls short: Built for local files: streaming sites generally need a separate download step, and there is no structured practice beyond card creation.
LingQ — Reading and listening volume tracking
A large graded library where every unknown word becomes a "LingQ" you can review, with known-word counts across lessons.
Where it falls short: Library-centric rather than video-centric, and the vocabulary system only pays off if you import or consume content inside its ecosystem.
Lingopie — Learning from TV series
Streaming library purpose-built for learners: dual subtitles, clickable words and per-show difficulty levels.
Where it falls short: Catalogue varies by region and is limited to what the service licenses, so your favourite show is often not available.
Readlang — Reading articles with inline translation
Import any text or web page, click a word for an inline translation, and export saved words to Anki. Minimal and fast.
Where it falls short: Reading only — no listening or speaking component, so comprehension grows faster than output.
Substital — Quick dual subtitles on streaming sites
Drop a second subtitle track onto YouTube, Netflix and Disney+ with a floating overlay, including a machine-translated track when none exists.
Where it falls short: It is a subtitle layer, not a study system: no review queue, so words you looked up are gone the next day.
How we ranked them
- Does it produce practice? A tool that only translates lowers friction but builds no recall, so anything translation-only ranks lower regardless of polish.
- Does the vocabulary stick? We favour tools that schedule review, because words met once are words lost.
- Platform and paywall honesty: we note which browsers are supported and which features you have to pay for.
- We list LangKey first because it is our product and it fits the criteria above — the limitation column applies to us too, and we suggest alternatives where they genuinely win.
Which one suits your study style
You want to speak, not just understand
Pick a tool with dictation, shadowing or speaking drills and a review queue — LangKey or Migaku. Translation-only tools will not move your output.
You live inside Anki
asbplayer if you work with local files; Migaku or LangKey if you want the mining to happen while you stream.
You mostly read the news
Immersive Translate for the lightest setup, Readlang if you want the words you looked up to become flashcards.
You learn from TV series
Lingopie for a purpose-built catalogue, Language Reactor if you bring your own Netflix subscription and use Chrome.
Frequently asked questions
Do language learning Chrome extensions actually work?
They work when they force retrieval rather than only removing friction. Dual subtitles help you notice words; spaced repetition and dictation are what make those words available later. A translation-only overlay tends to feel productive while producing little retention.
Is a free extension enough to learn a language?
Usually yes for input practice: most free tiers cover dual subtitles and lookups. The features that tend to sit behind paywalls are AI explanation, unlimited phrase saving and cloud sync — useful, but not what determines whether you improve.
Which extension works on Firefox?
Among the tools above, LangKey, asbplayer, Immersive Translate and Substital offer Firefox versions. Language Reactor and Trancy are built for Chrome-based browsers, which is a common reason learners look for an alternative.
Can I use two of these at the same time?
You can, but two subtitle layers will fight over the same video element. A cleaner split is one tool for subtitles and practice, and a separate one for reading, such as Immersive Translate for articles.