APDL and Logbook Pro are iOS 13 compatible. APDL has a few very minor layout issues which we will soon fix with footer text and the top bar where the clock and network info is located is black. Other than that we see no issues in the functionality or operation of the app that would prevent anyone from upgrading to iOS 13. If you find any issues please include screenshots and submit a support ticket via our help desk. iOS 13 is compatible.