Comparison
Language Reactor alternative: LangBox compared
Updated · Written by LangBox, so read it as a vendor's comparison
Language Reactor is a well-established browser extension for learning languages from Netflix and YouTube, used by about 2,000,000 people according to its Chrome Web Store listing. LangBox overlaps with it on video and goes further with reading: web pages, PDFs and EPUBs, plus dictation practice. This page sets out where each one fits.
Features of Language Reactor are listed only as its own site or store listing describes them; where it does not describe a feature, the table says so instead of guessing.
Listening and dictation vs. a combined reading workflow
Choose based on your daily study habits. If your routine centers on Netflix playback controls and existing word lists, Language Reactor fits well. If you want sentence-by-sentence YouTube dictation—which auto-pauses to check your typing without an account—alongside in-place web page, PDF, and EPUB translation with Anki word export, consider LangBox.
At a glance
| Language Reactor | LangBox | |
|---|---|---|
| YouTube dual subtitles | Yes | Yes: the original line with a translation under it |
| Netflix | Yes: dual subtitles, pop-up dictionary and playback controls | Yes: dual subtitles |
| Pop-up dictionary | Yes | Yes: double-click a word on web pages, PDFs and EPUBs |
| Reading web pages | Imported text, with machine translation and text-to-speech | In place: a translation under each paragraph of the page you are on |
| PDF and EPUB | Not described in its store listing | Yes: original beside the translation, page by page or chapter by chapter |
| Dictation practice on YouTube | Not described in its store listing | Yes: auto-pause after each sentence, type what you heard, each word checked |
| Saving words | Not described in its store listing | Yes: “Add to learning” in the dictionary; My words list with export to Anki |
| Price | Free, with in-app purchases | Free during the public preview; translation uses credits or your own API key |
Choose Language Reactor if…
- You mainly learn from Netflix and want its playback controls.
- You already have a word list and routine built in it and are happy with it.
Choose LangBox if…
- You want dictation practice on YouTube: the video pauses after every sentence, you type what you heard, and each word is checked. The transcript and dictation work without an account.
- You also read web pages, PDFs or EPUBs in the language you are learning and want one tool for all of them, with the original kept beside the translation.
- You want to save the words you look up and take them to Anki.
LangBox scope and preview limits
LangBox's desktop Chrome extension is separate from its browser tools and learning app. During public preview, guests receive 2M tokens once; accounts get 10M every 30 days. PDFs require an account (max 100MB, no page limit, kept 24 hours). Full EPUB exports require DRM-free text under 10MB, excluding covers, images, or complex layouts.