popup while timer being tested, not good at all, background popup, ads not yet but any popup while timer active is not a good experience right at the test trial, 1 star for that, on to a better one....
Developer reply
We’re sorry a pop-up interrupted your timer test. We understand that any interruption during an active timer is frustrating, especially when trying the app for the first time. We’ll share your feedback with our team to help improve the experience.