Forest combines Pomodoro timing with gamification. Each focus session grows a virtual tree. If you leave the app, your tree withers. The app uses the 25/5 cycle, but you can set custom times. Over time, successful sessions build a forest that reflects your productivity. Forest also partners with tree-planting organizations, so you can contribute to real-world reforestation. Forest is perfect for people who enjoy gamification and want motivation tied to environmental impact.