Is carbon VPN free?

I'm curious to know if Carbon VPN offers a free service. Could you please clarify if there's a free version available, or if all its features come with a subscription fee? Additionally, if there's a free trial period or a limited free plan, I'd like to know more about those options as well. Understanding the pricing structure and any potential free offerings is crucial for me to decide whether Carbon VPN is a viable option for my privacy and security needs.