PlugBrain is described as 'App that encourages regular breaks from distracting apps by blocking access at scheduled intervals. To regain access, you’ll need to solve a math challenge that adjusts in difficulty: the more frequently you use the apps, the harder the challenges become — but' and is a anti procrastination tool in the office & productivity category. There are seven alternatives to PlugBrain for a variety of platforms, including Android, Mac, Google Chrome, Safari and Mozilla Firefox apps. The best PlugBrain alternative is Mindful : Focus & Screen Time, which is both free and Open Source. Other great apps like PlugBrain are StayFree, One Sec, ScreenTimerAI and WallHabit.