iOS · iPhone & iPad
Fix an iPhone App That Won't Open or Keeps Closing
Source-checked About 10 minutes
Answer
Force-close the app, restart iPhone, update the app and iOS, check service and storage, then delete and redownload only after protecting its data.
Identify the exact symptom and scope
Before changing an iPhone app crash, note the app version, iOS version, free storage, exact action, network, and whether every app or only one is affected. Write down the exact error, affected device or app, and when it occurs; retest that same symptom after each change. Keep the model, version, and last successful state available for official support.
Match the repair to the symptom
Separate an app-specific crash, developer outage, account problem, storage pressure, iOS issue, and unsupported device or region.
Close and reopen the app
Open the App Switcher, swipe the affected app away, and launch it once more.
Restart and update
Restart iPhone, install the app's update from the App Store, and install a compatible iOS update.
Check scope and service
Test another app, verify network and free storage, and inspect the developer's official service status when sign-in or cloud content fails.
Redownload with care
Confirm how the app stores and syncs data before deleting it, then redownload; contact the developer with the crash time and device details.
Retest the original symptom
The same action works twice after the narrow fix and the app's signed-in data, purchases, and permissions remain intact.
Troubleshoot an iPhone app crash
If the app closes at the same action, redownload would erase local data, or the developer reports an unresolved service issue, stop broad resets and return to the last known state. Capture the exact error, versions, account or device scope, and the failed step before using the official support channel.
Video walkthrough
Sources and verification
Checked against official documentation on . Scope: iPhone & iPad.
Follow the linked first-party guidance if labels differ after a platform or app update.