What ever mobile app development you consider you will have to note the functional and the non functional requirement It is very important to know all these requirement and we one of the best mobile app development companies in dubai are listing some of the non functional requirements for IOS mobile app  PerformancePerformance is nothing but how fast the app works it is very important that the app works  faster since it is the reason for the success of the app one of the best example of best performance of the app is that the app should load with in 5 seconds  Responsiveness When ever there is a input from the user the app should react immediately and the responsiveness of the app is measured by that one of the best examples of responsiveness is when you are booking lunch in a restaurant you should be also be able to switch to search the route of the restaurant Scalabality When the apps are released to the app store they are used extensively and the apps should be prepared for the extensive use once they are released  Usability When you develop the apps it is for the users and apps should be more usable you can measure the app only when the apps are used extensively ReliabilityReliabality is the one when your apps that works to provide the desirable result for the most of the time or it is the amount of time the app returns the result what is required by th user and the reliability is measured by that  Modifiability The apps needs to be changed occasionally and one of the non functional requirement is that how easy the app can be changed  Maintainability Every app has the bug and the maintainability relates to how easily you can find the bug and fix them Conclusion The above are the non functional requirement of the IOS mobile app and we one of the best IOS app development companies in dubai where we take care of the non functional requirement