Dictionary lookups often give the wrong meaning when a word has several senses. LingTube uses the subtitle line and part of speech to give the meaning used in that sentence. It also adds part-of-speech colors with furigana and pinyin, grammar breakdowns with CEFR levels, transcription for videos without captions, shareable timestamped notes, danmaku on YouTube and Netflix, and AI Q&A that knows the video. YouTube chapters, heatmap and Shorts still work.