App crashes are highly disruptive to user experience, leading many users to uninstall problematic apps, but out-of-memory (OOM) errors, which occur when the operating system terminates an app to free up memory, can be equally disruptive. Although OOMs are not technically crashes, users often perceive them as such, and they can significantly impact app usability, particularly when they occur in the foreground, known as FOOMs. To mitigate OOMs, developers should focus on efficient memory management by understanding device memory limits, avoiding memory leaks like retain cycles, managing cache usage effectively, and tracking OOM occurrences to measure the impact of their optimizations. Tools such as Jan Ilavsky's memory threshold identifier and Luciq for detecting and reporting OOMs can assist developers in reducing their app's memory footprint and ensuring a smoother user experience.