iOS is a mobile operating system created and developed by Apple Inc. exclusively for its smartphones, tablets, smartwatches and other hardware products. It is till date considered very secure OS for the users concerned with their privacy. For the same reason market for the iPhone users keeps growing even after opensource rivals came into the market. It is a very required skill in the IT industry to develop apps for iOS. Salary and stability for iOS developers is very good compared to other similar jobs due to high demand. To know more about flutter visit https://developer.apple.com