Do you have to pay for the Bubble app?

Excuse me, I'm just curious about this Bubble app. I've heard some great things about it, but I'm not entirely sure about its pricing. Could you clarify for me if the Bubble app has any costs associated with its usage? Is it free to download and use, or do I need to pay a certain fee to access its features? I'd really appreciate it if you could provide some clarity on this matter.