Doesn’t work!
Response from developer
Sorry about this. The failures you hit were fixed when we rebuilt the app in version 1.5 — and a design that fails now never uses one of your credits, with a retry and a contact button right on the error. Refunds for past charges go through Apple at reportaproblem.apple.com; we're also at favamvv@gmail.com.
Scam
Response from developer
We're sorry. The paywall back then advertised a free trial on a plan that didn't include one — that was our bug, and it's fixed: a trial is only offered now when your account is actually eligible, and every plan shows its price before you confirm. The generation failures from that time were also fixed in the 1.5 rebuild. Apple handles refunds at reportaproblem.apple.com; for anything else, write to favamvv@gmail.com.
