You can easily check and compare how much a game is sold on different platforms with Key Master. This extension enables you to see the game price on G2Play, G2A, and Kinguin. You don’t have to leave the Steam Store, and go to different websites, making it convenient and time-saving. 

Aside from this, when you click on one of the buttons, you'll be redirected to the platform selected. So, you can go purchase the product at the store right away. Key Master helps make sure you get your favorite game at the best prices, so you can save money.