Focus Detector is a Chrome add-on designed to help users measure and improve their concentration while using specific websites. Utilizing facial detection technology through your browser's camera, it tracks whether you are facing the screen and calculates your focus duration in real-time. The tool generates visual historical curves, allowing users to assess their focus trends over different time frames, such as hours, days, or weeks, and helps identify peak concentration periods.

Key features include customizable focus websites, alerts for when you step away for more than five minutes, and an easy-to-use interface with a real-time status bar. The add-on automatically saves focus and distraction timestamps and allows data export in JSON format for further analysis in tools like Excel or Notion. With a focus on privacy, all data processing occurs locally, ensuring that no video streams or personal information are sent to external servers.