Thank you for using ibisPaint.
iOS 13 has been released officially on 19/Sep/2019.
Currently, the following bug has been confirmed on iOS 13.

- The app crashes and does not launch if "Pogo Connect" or "Wacom Stylus" is selected in "Pressure Sensitive Stylus" of Settings.

Thus please do not select these styluses if you have already updated to iOS 13.
Please select other stylus before update to iOS 13 if you are now selecting these styluses.
We've already submitted a new version app which fixed this problem to Apple.
We're sorry for the inconvenience if your app have already crashed.
Please wait until the new version release.