Memory leak is one of the most critical issues that can occur in an app. Fixing them is often challenging as the developer will not have access to the relevant data to identify the root cause. All that developer may get to see is an OutOfMemory (OOM) Exception with a stack trace that is of no practical use. There are tools like LeakCanary for Android and XCode Leaks Instrument for iOS. These tools will help identify the leaks in the development environment. That is, if the de