Kairos - Your AI Video Note-Taking Companion

Watch with AI. You choose what matters; Kairos helps you take notes from frames and subtitles on YouTube & Bilibili.

Take timestamped notes with AI while watching videos on YouTube and Bilibili. Kairos keeps your notes connected to the moments that matter, so you can capture an idea while watching and return to it later. • Write notes without leaving the video. • Capture a selected area of the video and add your thoughts. • Click a note to jump back to its timestamp. • Review notes in the sidebar or a movable, resizable overlay during fullscreen playback. • Use optional AI assistance to explain selected content and summarize saved notes. • Export notes as Markdown. Manual note-taking does not require an API key. To use AI features, configure a supported provider with your own key in Settings. Provider charges may apply. Notes and screenshots are stored locally in your browser. When you use AI features, relevant content is sent to your selected provider. Settings and API keys may sync through your Chrome account when browser sync is enabled.