Hi there! I understand how frustrating it can be when an app won't start properly. Let’s work together to get the Expensify app up and running on your iPhone.

Here are some steps we can try:

1. Restart Your iPhone: This often fixes minor issues. To do this, press and hold the side button and a volume button until you see the power off slider. Slide it, wait for your device to turn off, and then turn it back on.

2. Close Background Apps: Sometimes, running apps can interfere. To do this, swipe up from the bottom of the screen and pause slightly to open the app switcher. Swipe left or right to find the Expensify app and swipe it off the screen to close it.

3. Check for iOS Updates: Make sure your iPhone is running the latest version of iOS. Go to Settings > General > Software Update and check if an update is available.

4. Reinstall the App: If the app still crashes, uninstall it by pressing and holding the Expensify app icon until you see a menu, then tap 'Remove App' and confirm. After that, go to the App Store, search for Expensify, and reinstall it.

5. Clear App Cache and Data: Although this process varies a bit on iOS, reinstalling usually clears the data. If you used the app offline, make sure there is a stable internet connection when reopening.

6. Device Storage: Ensure you have enough available storage on your iPhone. Go to Settings > General > iPhone Storage to check.

Let me know if you've tried any of these steps or if the problem persists. We can dig deeper if needed!