Is Box online free?

I'm curious, could you please clarify whether Box is available for free online? I've heard mixed reviews and would like to understand if there's a version that doesn't require a subscription or payment. It would be great if you could elaborate on any limitations or restrictions that come with a free account, if there is one. Additionally, could you provide any insights into whether there are any hidden costs or additional charges that users might encounter while using Box, even if it's initially advertised as free?