How to Fix a Crashing App on Mac

If an app on your Mac keeps crashing—closing suddenly, freezing, or showing the “unexpectedly quit” dialog—this guide walks you through the most effective fixes, from quick restarts to deeper system-level resets. You’ll need your Mac’s administrator password for some steps, and possibly a backup of the app’s data.

What You’ll Need

Administrator access to your Mac (to install updates and delete files).
Time: 5–20 minutes depending on the cause.
Optional: an external backup (Time Machine or other) before deleting app data.

Step-by-Step

Force quit the app if it’s frozen. Press Option+Command+Esc, select the app in the Force Quit window, then click Force Quit. This is a clean way to stop a hung process without restarting your Mac.
Relaunch the app. Open it again from the Dock or Applications folder. If it works, the crash was likely a one-time glitch. If it crashes again, continue.
Check for app updates. Open the App Store and click Updates in the sidebar. If the app was downloaded from the web, use its built-in update feature (usually under the app’s menu, e.g., App Name > Check for Updates). Install any available updates—developers often fix crash bugs.
Update macOS. Go to System Settings > General > Software Update and install any pending updates. macOS updates can resolve compatibility issues with apps.
Restart your Mac. Choose Apple menu > Restart. This clears temporary system caches and can fix crashes caused by memory leaks or background processes.
Check if the app is compatible. If the app is old, it may not support your macOS version. Look at the app’s documentation or the developer’s website for system requirements. If it’s not compatible, you may need an older version of macOS or an alternative app.
Reset the app’s preferences. Quit the app. Open Finder, press Shift+Command+G, and type ~/Library/Preferences. Find files that start with the app’s name (e.g., com.example.app.plist) and move them to the Desktop (don’t delete yet). Relaunch the app—it will create new preference files. If the app works, the old preferences were corrupted. You can then delete the moved files.
Delete the app’s cache and support files. In Finder, press Shift+Command+G and go to ~/Library/Caches and ~/Library/Application Support. Look for folders with the app’s name and move them to the Trash. Be careful: this may log you out of the app or reset its settings. Only do this if the preferences reset didn’t help.
Reinstall the app. Drag the app from the Applications folder to the Trash, then empty the Trash. Download a fresh copy from the App Store or the developer’s website and install it. This replaces any corrupted application files.
Run First Aid on your disk. Open Disk Utility (in Applications/Utilities). Select your startup disk (usually “Macintosh HD”), click First Aid, then Run. This repairs disk permissions and file system errors that can cause crashes.
Boot into Safe Mode. Restart your Mac and hold the Shift key until the login window appears. Safe Mode runs a disk check and prevents some third-party software from loading. Try the app in Safe Mode. If it works, a login item or extension is likely causing the crash. Restart normally and check your login items in System Settings > General &em; Login Items.
Check Activity Monitor for resource issues. Open Activity Monitor (in Applications/Utilities). Look at the Memory and CPU tabs. If your Mac is low on memory (the memory pressure graph is red or yellow), close other apps or add more RAM if possible. If the app uses excessive CPU, it might be stuck in a loop—force quit it and update it.
Create a new user account to test. Go to System Settings > Users & Groups, click the plus sign, and create a new administrator account. Log into that account and try the app. If it works, the problem is specific to your user account’s settings or files. You can then migrate your data or reset your original account’s preferences.

Common Mistakes

Skipping the restart. A simple restart resolves many crashes, but people often jump straight to reinstalling.
Deleting preferences without backing up. You might lose custom settings. Always move files to the Desktop first, not the Trash.
Ignoring system updates. Running an outdated macOS can cause compatibility crashes.
Reinstalling over the same corrupted files. If you drag the app to the Trash but keep its support files, the problem may persist.
Using “force quit” as a habit. Force quitting can lead to data loss if the app has unsaved work. Use it only when the app is unresponsive.

Tips

Keep your apps updated. Enable automatic updates in the App Store or the app’s settings.
Monitor memory pressure. If you frequently have many apps open, consider closing unused ones or upgrading RAM.
Use Time Machine. Back up your Mac regularly so you can restore app data if needed.
Check the developer’s support pages. Many apps have known issues and workarounds listed on their website.
Use the “Report to Apple” button. When an app crashes, the dialog may ask to send a report. This helps developers fix bugs, and you can include a comment about what you were doing.

Troubleshooting

If the app still crashes after all steps:

Check if the crash is hardware-related. Run Apple Diagnostics by restarting your Mac and holding D. Follow the on-screen instructions. If hardware issues are found, contact Apple Support or a certified technician.
Look for third-party extensions or plugins. Some apps load plugins that can cause crashes. Remove any recently installed plugins or extensions for that app.
Use the Console app to view crash logs. Open Console (in Applications/Utilities), select Crash Reports in the sidebar, and find the app’s log. The “Exception Type” and “Termination Reason” lines can give clues—search the web for those exact terms.
If the app is from the Mac App Store, try downloading it again. Sometimes the download is corrupted. Delete the app, then go to the App Store’s Purchased tab and click the download icon.
Consider a clean install of macOS. If multiple apps crash and you’ve exhausted other options, backing up and reinstalling macOS may resolve deeper system issues. This is a last resort.

Frequently Asked Questions

Why does my app crash only when I open a specific file?

The file itself may be corrupted or incompatible. Try opening a different file to confirm. If the app crashes only with that file, try converting it or recreating it.

Will deleting the app’s preferences delete my data?

Preferences usually only store settings, not your documents or project files. However, some apps store data in the same folder. Always move the files to the Desktop first and test before deleting.

How do I know if an app is 32-bit and causing crashes?

On macOS Catalina and later, 32-bit apps are not supported. If you have an older app, check its “Get Info” window—if it says “32-bit (Intel)” or similar, it won’t run. Look for a 64-bit version or an alternative.

Can a faulty RAM stick cause app crashes?

Yes, faulty RAM can cause random crashes. If you suspect this, run Apple Diagnostics (hold D at startup) or use the built-in Memory Test in some Mac models.

Why does the app crash after my Mac wakes from sleep?

This can be a power management issue. Try resetting the SMC (System Management Controller) on Intel Macs, or check for macOS updates. On Apple Silicon, a restart usually clears the issue.

Is it safe to use “sudo” commands to fix app crashes?

Only if you know exactly what you’re doing. Incorrect terminal commands can damage your system. Stick to the steps above, and if you need to use the terminal, follow a trusted guide.

General steps for current mainstream versions; menus can differ by device and version. See the disclaimer or report an error.

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