Is the Bubble app free?

I'm just wondering, is the Bubble app free? I've been hearing a lot about it recently and it seems like a really cool platform for connecting with friends and discovering new things. But before I download it, I want to make sure there's no hidden costs or subscriptions involved. Could you please clarify if the Bubble app is indeed free to use, and if there are any in-app purchases or additional fees that I should be aware of? Thank you in advance for your help!