No customer support?
I bought this math app because of teacher recommendation. The timer does not appear to work properly on an IPhoneX running IOS 13.7. No matter what delay is specified, the timer responds immediately with the message that I took too long: it allows zero seconds for answering the problem. I am unable to find a link for customer feedback within the app or at the developer website, accessed through the App Store. I can certainly run the program without the timer, but more than that annoyance, the absence of a link for customer service in a paid app is disappointing.