Product testing may not earn you big bucks, but the legit companies won’t ask you to pay money for anything. Steer clear of any company, app or website that insists you must pay them before you get “free" products, and avoid anyone who promises a hefty cash payment for a small amount of your time or a couple reviews; if it sounds too good to be true, it usually is. Additionally, you do not need to pay for access to product testing opportunities (every option on this list is freely available), and there is no training or certification required to test products.