Polar is an AI-enhanced, cross-platform distraction blocker. Users set allow and blocklists for sites and apps, then describe their current task (like studying biochemistry). The app and web extension then use path-level filtering to block only irrelevant sections of sites. For example, blocking r/memes while allowing r/biochemistry on Reddit. Users can also manage focus with Pomodoro timers or custom break schedules within a study period.