An APR of 10% is good for credit cards and personal loans, since it's cheaper than the average. On the other hand, a 10% APR isn't good for mortgages, student loans, or car loans, since it's much higher than most borrowers should expect to pay. A 10% APR is valid for a credit card. The average APR for a credit card is 20.16%.
A credit card APR of less than 10% is definitely good, but you might have to go to a local bank or credit union to find it. The Federal Reserve tracks interest rates on credit cards, and a below-average APR would also be considered good.