Is cloud a free app?

Excuse me, I'm a bit confused about something. I came across an app called "Cloud" and I'm wondering if it's a free service or not. I've seen some apps that offer basic features for free but charge for more advanced ones, and I'm trying to figure out if that's the case with Cloud as well. Could you please clarify whether Cloud is a completely free app, or if there are any costs associated with using it? Thank you for your help.