Pawn.

Find upgrades, do more damage, win.
Pawn helps you find upgrades for your gear and tell which of two items is better for your spec. Start with built-in advice from Ask Mr. Robot, or customize Pawn's stat weights to have it suggest items based on your favorite class guide or simulator. Pawn can help you decide whether it's better to use the cloak with 100 mastery or the one with 80 crit—whether you're just starting out, or you're an advanced player who plans out gear upgrades and regularly simulates and evaluates performance.

If you're new to Pawn, don't worry—Pawn will automatically set itself up to give you advice based on math done by the experts at Ask Mr. Robot (or, on Classic versions, HawsJon). Just watch for Pawn's green arrows. If you decide you want to go further, there are a lot of ways that you can customize Pawn, by tracking multiple specs at once, importing custom stat weights, and more.