I got the free version and upgraded in the app for $0.99 to allow altering the time allotment. I found that if I have reset a timed test more than a couple of times, the “Next Task” button no longer shows up. I need to close and reopen the app for each new timed test in order to avoid this. It’s ok for what it does - no bells/whistles. Using iPhone Pro 12, software v. 14.4