Hello! I understand your InFocus Pro calendar app stopped working after updating your iPhone to iOS 18. Could you tell me a bit more about what exactly is not working with the app? For example, does it fail to open, crash, or not sync your calendar events? Any extra details will help me assist you better.

In the meantime, iOS 18 has introduced some changes that have affected Focus Mode and calendar integrations for some users. There have been reports that after updating, users need to manually re-select calendars or reconfigure some Focus settings for calendar apps to work correctly again.

Here are some steps you can try that often resolve these issues:

1. Restart your iPhone: Simple but effective, it can refresh your system.
2. Check InFocus Pro app permissions:
- Go to Settings > Privacy & Security > Calendars and ensure InFocus Pro has access.
3. Double-check your Focus Mode calendar settings:
- Open Settings > Focus, select your active Focus mode, and see if InFocus Pro is included or needs re-adding.
4. Update the app: Verify if an InFocus Pro update is available in the App Store that addresses iOS 18 compatibility.
5. Reinstall the app: Uninstall and reinstall InFocus Pro after backing up any critical data if needed.
6. Reset network settings: Sometimes network glitches affect app sync. Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings.

If none of these work, there might be a temporary compatibility issue that the developers need to patch. I can check if there is any announcement or update timeline on this.

Does this align with what you have tried so far? Let me know any additional info you have, and we can dig deeper or I can confirm next steps for you. Are you okay to try the above and get back to me?