Does the bubble app cost money?

I'm curious, does the bubble app actually cost money to use? I've been hearing a lot about it recently and it seems quite popular. But before I jump in and start downloading, I want to make sure there's no hidden fees or charges involved. After all, who doesn't love freebies? So, could you please clarify for me if the bubble app is indeed free to use or if there's a cost involved? I'd appreciate your insights on this matter.