It's not out of the question to have 'memory leaks' - apps accumulating more memory by keeping around references to more and more objects - but memory leaks in the stricter sense of not deallocating objects that you no longer have references to is less likely. Regardless, the OOM killer will come for your app, no matter how good you've been about managing your memory, as long as someone else wants to have the memory and you're the one who has been active the least recently.