Zero is described as 'Beautifully designed tracker used for intermittent, circadian rhythm, and custom extended fasting. As the largest app-based fasting community in the world, Zero makes it simple for you to harness the power of fasting to improve your health' and is an app. There are more than 10 alternatives to Zero for a variety of platforms, including iPhone, Android, iPad, Android Tablet and HUAWEI AppGallery apps. The best Zero alternative is JustFast, which is free. Other great apps like Zero are iFast - Simple Fast Tracker, Easy Fast, FastMinder and BodyFast Intermittent Fasting.