One of the features of the best app business is simplicity for the user. An app should be accessible across multiple platforms while offering the highest performance possible, quickly launching without lagging or glitching. This is what the best app design firms can provide to you. The companies below have been reviewed based on a wide range of qualitative and quantitative statistics. In some cases, variable listing fees effect position on this list; however only highly-regarded firms are accepted through our review analysis. Learn more about our ranking process here.