LangKey vs Immersive Translate: Translation Tool vs Learning Tool
Immersive Translate is an excellent reading aid — bilingual webpages, PDF and ePub translation, and dual subtitles on many video sites. But its job ends at comprehension: nothing helps you remember a word tomorrow or say a sentence out loud. If your goal is learning the language rather than just reading past it, LangKey is built for exactly that — and it is free and open source.
| Feature | LangKey | 沉浸式翻译 (Immersive Translate) |
|---|---|---|
| Core purpose | Language learning (practice + retention) | Translation (comprehension) |
| Price | Free core, open source | Freemium; advanced features require Pro |
| Open source | ||
| Bilingual webpage / PDF translation | Selection translate + article learning | |
| Dual subtitles on video sites | ||
| Bilibili support | ||
| Click-to-translate with context examples | Basic hover translation | |
| Dictation practice | ||
| Shadowing / speaking practice | ||
| AI conversation & cloze exercises | ||
| SRS review + Anki import / export |
Where Immersive Translate Still Wins
- Unmatched translation coverage — bilingual webpages, PDFs, ePub ebooks, and input-box translation, far beyond what any learning tool attempts.
- Supports a very long list of video sites for plain dual subtitles.
- Huge brand recognition in the Chinese market, with abundant tutorials.
Where LangKey Wins
- Built for retention, not just comprehension — dictation, shadowing, AI conversation and cloze modes make you produce the language, which is how it actually sticks.
- A real vocabulary loop — every looked-up word flows into SRS review with free Anki import/export.
- Interactive subtitles designed for study — sentence navigation, replay, and per-word lookup tuned for learners.
- Free and open source — learning features are not locked behind a Pro plan.
The Verdict
Keep Immersive Translate if you mainly need to read foreign webpages and PDFs — it is the best at that job. Add LangKey when the goal shifts from reading past a language to learning it: dual subtitles plus dictation, shadowing, AI conversation and an SRS vocabulary loop, free and open source. Many learners run both, each for what it does best.
Frequently Asked Questions
Can LangKey replace Immersive Translate?
They solve different problems. Immersive Translate is for reading webpages and PDFs in translation; LangKey is for learning a language from videos and articles with practice modes and vocabulary review. Many people use both side by side.
Does Immersive Translate have speaking or dictation practice?
No. As of 2026 it focuses on translation and display. LangKey adds 7 practice modes including dictation, shadowing and AI conversation.
Does LangKey support bilingual subtitles like Immersive Translate?
Yes — on YouTube, Bilibili, TED and Netflix. The difference is what happens next: in LangKey every subtitle line is clickable for translation, practice and vocabulary saving.
Is LangKey free and open source?
Yes. The core learning features are free on Chrome, Edge and Firefox, and the source code is public on GitHub.