Google Calendar only gives you 11 colors. If you're juggling work, personal, side projects, and kids' schedules, that's not enough. PaintCal adds a color picker directly in Google Calendar. Click any event, pick any hex color, done. Works with recurring events too. Why free? I run FriendFilter and GroupFilter (120K+ users). PaintCal started as a personal itch, I wanted more colors. Figured others did too. No account, no data collection, no catch.