Leather is a free Chrome add-on developed by Leather that aims to make it easier for users to determine which credit card is best for a given purchase. It is specifically designed to help users remember which credit card offers the best rewards for different types of purchases, especially if they own multiple cards.

With Leather, users can keep track of the types of cards they use and receive recommendations on the card that will provide the best rewards when making online purchases. This eliminates the need for guesswork and allows users to focus on saving money without the hassle of remembering complex reward structures.

It's important to note that Leather does not require users to provide sensitive credit card information, ensuring a secure and comfortable experience while optimizing card rewards.