Do you have to pay to use a Box?

Hey there, I've been hearing a lot about Box lately and I'm curious about its pricing model. So, let me ask you this - do you have to pay to use a Box? Is it a free service or do they have some sort of subscription plan that users need to sign up for? I'd love to know more about how their pricing structure works and what kind of features are included in their paid plans, if any. Thanks in advance for your help!