GasBuddy and Upside are both useful apps for those trying to save money on gas. GasBuddy is extremely helpful for finding and comparing the best gas prices based on their location. Upside, however, is a cash back app that gives customers money back when fuel is purchased from a qualifying station. Therefore, GasBuddy is better for those looking to find the cheapest gas, while Upside is better for those less concerned with price but want money back on their gas purchases.