Try it before you pay. Ten minutes of real tracing, free: your own photos, the whole starter library, the lock, the grid and the line-art conversion. The clock only runs while you are actually tracing, so putting the phone down, taking a call or sleeping on it costs you nothing. After that, one payment unlocks Dürer for good. It is not a subscription, it does not renew, and there is nothing to cancel. You can unlock at any time from Settings. Also fixed: a glitch in the hold-to-unlock control when releasing it.