If you’re going to shop for beauty products, read this.

You might as well be throwing money away if you’re not using . This browser extension knows nearly every trick in the cost-saving book and will automatically try them for you (and the 10,000,000+ other people currently using it).

Here’s how it works:

Shop at Clinique, Sephora, or tons of other major retailers? When you check out, will instantly look for working coupon codes and discounts to apply them to your order.

Ever shop on Amazon? automatically checks other sellers for a better price, including sales tax + shipping. A notification will appear in seconds if a better offer is found.

The best part? It’s completely free. Do yourself (and your wallet) a favor and get Capital One Shopping .