A white screen or endless spinner on launch is almost always the app's local data getting stuck, and the reliable fix is to refresh the app's data, then make sure you're on the latest app version, since this crash has been tied to specific app releases and updating is what resolved it for users in this thread. In the meantime, you can keep working right away by signing in at qbo.intuit.com in a web browser, which is exactly why everything still works on your computer.
Fastest unblock: use a browser
Sign in at qbo.intuit.com on your phone or computer to keep managing your work while you fix the app. Your data is fine; the issue is local to the app. One tip for iPhone: use Safari with Private Mode off, since QuickBooks needs cookies and other iOS browsers aren't officially supported: QuickBooks Online access for mobile devices.
Step 1: Refresh the app's data
Refreshing pulls a clean copy of your data from the QuickBooks servers.
- iOS: open the app menu, tap Help & Feedback, then Refresh Data, then Refresh.
- Android: open the menu, tap Settings, then Refresh Data, then Yes.
Reference: See your latest data in the QuickBooks Online app.
Step 2: Clear the app's stored data
If a refresh doesn't clear it, reset the app's stored data.
- iOS: go to Settings, then General, then iPhone Storage, select the QuickBooks Online app, then Offload App (this refreshes it without deleting your documents), then reinstall from the App Store.
- Android: go to Settings, then Apps, select the QuickBooks app, then Storage, then Clear data. Restart your device and reopen the app.
Step 3: Update to the latest version (this is often the real fix)
Update the app from the App Store or Google Play; users in this thread confirmed a later release resolved this exact crash, which is why reinstalling an old version only helps briefly. If needed, uninstall and reinstall to get a clean, current copy, and make sure your device itself is supported: QuickBooks Online access for mobile devices.
If it still won't open (or won't reinstall)
Reach out to live support so they can look at your account securely and check for anything specific to your setup: Contact QuickBooks support.
If you let us know your device and current app version, we can tell you whether an update is available that addresses this.