One of the concerns of app developers and marketers is a user engagement, which is used to identify the success of any app they develop. The proportion of the value should go among users, adding better experience in their uses. Particularly relevant are the clicks, ratings, and reviews but these are not the only indicators to measure an app’s performance. There is not only one criterion defining the quality of the submission. Production of Mobile Apps depends on various other metrics. When the idea for the app goes through the development process, user interaction is a requirement for the development of the mobile device project before the product goes on the floor. The number of applications in the app store and play store is massive, so promoting an app and measuring user engagement is a challenge too. For an app to be efficient the correct metrics must be used and the software programmed to set goals of IR. We have the right combination of user engagement metrics here to measure user interaction and performance with the app. Number of Users The total number of users including old and new users who joined the user base recently is the most important metric for identifying the user engagement for an app. Number of Downloads The number of downloads for an app is directly proportional to the amount of user interaction. More number of users, the greater an app’s popularity. Active Users The next level metric is for active users. That decides whether or not the users are actively using the app. Session Interval The session interval is the time between your application’s two consecutive sessions when a user opens and begins using it. It also shows the frequency by which a user opens the application and uses it. Session Length The session length is one of the most relevant indicators helping to define user interaction. The session length is the amount of time a single user spends between opening and closing an app. Conclusion The development of mobile apps is the phase in which apps are created to capture proper user engagement and ensure a good number of downloads are available. When a developer works on an app that aims to make it successful, there must be a way to assess the success on a scale. Such key indicators are simple to have a good picture of whether or not the app is getting strong user engagement.