Linglass

Linglass turns video watching into active language practice on YouTube and Netflix. With dual subtitles, you can see two languages on screen at once while Linglass keeps the lines aligned with the original dialogue, so subtitles don’t drift.

Click any highlighted word in a video to get an instant, context-aware translation that reflects what that exact sentence means in the scene. You also get native pronunciation plus phonetic transcription (IPA, and Pinyin or Romaji where applicable). For deeper understanding, Linglass includes level-aware AI grammar explanations that explain how the sentence is constructed—covering things like tense, particles, word order, and how words link together.

To help learning stick, Linglass saves words automatically into smart flashcards. Saved items include visual context (a screenshot from the video) and the subtitle audio clip, so you can review what you actually heard and saw. Scheduling uses an FSRS-based approach, handling review timing for you.

Linglass is available as a free extension with no account needed to start watching, offering dual subtitles, 15 contextual translations per day, unlimited saved words and flashcards, pronunciation with phonetic transcription, and 5 AI grammar explanations per month. Premium is $5.00/month or $59.99 for 12 months and removes limits for contextual translation and provides grammar breakdowns for any line, plus AI subtitles/translation for videos without subtitles and subscription auto-renewal that can be canceled anytime.

What can I do with Linglass while watching YouTube or Netflix?

You get dual subtitles for the video, plus click-to-translate for highlighted words. You can also access pronunciation and AI grammar breakdowns without leaving the video.

Does the translation match the exact sentence in the scene?

Yes. Clicking a highlighted word shows a context-aware translation that reflects what the sentence means in that specific phrase, not just a generic dictionary entry.

What pronunciation and phonetic info does Linglass provide?

Each clicked word includes native audio pronunciation and phonetic transcription, including IPA. It also shows Pinyin or Romaji where relevant.

How does Linglass handle grammar explanations?

Linglass provides AI grammar explanations for the sentence you’re watching, covering how it’s built (such as tense, particles, word order, and links between words). Explanations are level-aware across A1–C2 and exam levels like JLPT/HSK/TOPIK.

How do saved words turn into flashcards?

When you save words, Linglass automatically creates a flashcard deck for you. Each card includes a screenshot from the video and the subtitle audio clip, and review scheduling is handled by an FSRS-based algorithm.

What’s included in Free vs Premium?

Free 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. Premium costs $5.00/month or $59.99 for 12 months and removes contextual translation limits and allows grammar breakdowns for any line, with additional AI subtitle/translation features.