Linglass

Linglass helps you turn video watching into active language practice. Use a browser extension (and a mobile app) to watch YouTube and Netflix with dual subtitles, so you can compare two languages on screen while keeping your place in the original dialogue.

With Linglass, you can click any highlighted word in a video to get a context-aware translation (the meaning for that exact sentence), native pronunciation, and phonetic transcription (IPA, plus Pinyin or Romaji as applicable). Linglass also includes level-aware AI grammar explanations that break down why a sentence is built the way it is—covering elements like tense, particles, word order, and links between words.

To make learning stick, saved words are automatically organized into smart flashcards scheduled by an FSRS-based system. Each saved item includes visual context (a screenshot from the video) and an audio clip from the subtitle, helping you remember what you actually heard and saw.

Linglass offers a Free plan with dual subtitles, contextual translations (15/day), unlimited saved words and flashcards, and pronunciation/phonetic transcription, plus 5 AI grammar explanations per month. When you’re ready, Premium is available for $5.00/month or $59.99 for 12 months, adding unlimited contextual translation and more grammar breakdown capacity. No account is needed to start watching.

How does Linglass help when a YouTube or Netflix video is already in a language I’m learning?

Linglass overlays dual subtitles and keeps them aligned with the original dialogue. You can click highlighted words to see context-aware translations along with native pronunciation and phonetic transcription.

What do I get when I click a word in the subtitle?

You get a translation for that specific sentence, native pronunciation, and phonetic transcription (including IPA, with Pinyin or Romaji where relevant). This makes the meaning match the scene you’re watching rather than a generic dictionary entry.

Does Linglass include grammar explanations, and are they level-based?

Yes. Linglass provides AI grammar explanations that break down how a line is constructed, calibrated to your level (A1–C2 plus JLPT/HSK/TOPIK options).

How are saved words turned into flashcards?

When you save words from videos, Linglass automatically builds a flashcard deck for you. Scheduling is handled by an FSRS-based approach, so reviews are planned for when they’re most useful.

What’s included in the Free plan?

The Free plan is $0 forever with no account needed. It includes dual subtitles on YouTube and Netflix, 15 contextual translations per day, unlimited saved words and flashcards, pronunciation with phonetic transcription, and 5 AI grammar explanations per month.

What does Premium change?

Premium removes limits for contextual translation and gives AI grammar breakdowns for any line. Pricing is $5.00/month or $59.99 for 12 months.