With the immense growth of Shopify, developing apps for the platform has become a highly profitable business. The Shopify app store contains 2,500+ various plugins for merchants, many of which are top sellers. This is why, if you have an idea for your own app, you should try to execute it. Learning how to write a Shopify app that will sell well is complicated – the process can be long and exhausting. We would like to give you a step-by-step guide on how to develop a Shopify app and promote it to get as many users as possible.