KBChan is a browser extension designed to support immersion learning for Japanese language learners by integrating annotated subtitles into streaming platforms. The extension overlays a sidebar on services such as Netflix, YouTube, Crunchyroll, Amazon Prime, Stremio web, and local video files, allowing users to view selectable subtitles with breakdowns, annotations, and optional furigana while watching native Japanese content.
A key feature of KBChan is its instant lookup capability: users can hover over any word in the subtitles to access definitions, kanji breakdowns, and grammar explanations, powered by the KanjiBreakdown desktop app. The extension also enables one-click mining, automatically capturing sentence context so users can add words directly to their review lists. Personalized highlights indicate known words based on the user's KanjiBreakdown level and recommend new words to focus on, helping learners target areas for improvement.
KBChan connects with the KanjiBreakdown desktop app, allowing users to conduct reviews directly in a popup while watching content, maintaining the immersive experience. The study mode feature presents content as a study list, making it easier to identify and review words that require additional attention. As part of the broader KanjiBreakdown ecosystem, KBChan works alongside other tools such as the KanjiBreakdown web platform, which stores review progress and personal mnemonic stories, and the desktop app, which provides a popup dictionary overlay and OCR for images like manga. Future plans include expanding to a native macOS desktop app and mobile applications for iOS and Android.
KBChan is available as an extension for Chrome and Firefox browsers. The tool is positioned as part of an integrated suite aimed at facilitating efficient language acquisition through immersion with native media content.
In the Education & learning space, KBChan takes a focused approach. It helps language learners study Japanese by providing annotated subtitles and instant lookups while watching native content. It is built as a consumer product for japanese language learners. There is a free tier. KBChan is available on the web and embeddable surfaces.
KanjiBreakdown builds and maintains KBChan. Key capabilities include subtitle annotation, instant word lookup, and kanji breakdowns.
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