App wouldn't open. I have an S6. The developer responded and updated the app.
Developer reply
Update: I've just updated the app to support Android 11 (API 30). Google Play is processing the change; it takes them 1-3 days to approve. If you are still having trouble, pls let me know. Oh no!! I'm so sorry to hear that. I've just opened the app on several phones and it seems to be working fine - can you let me know the operating system/API...