One credit is one draft thumbnail. Credits never expire, and you are only charged when an image is actually produced — a failed generation is refunded automatically.
Enough to judge the output yourself.
For a steady upload schedule.
For teams and channels shipping daily.
Draft is the default and is the better value for most thumbnails. Quality uses a slower model with sharper typography and stronger face consistency — worth it when the design leans on text or on a recognisable person.