Can I build multiple apps?
Both the free plan and the PRO plan let you build one app per license (Though obviously you can have unlimited free licenses as... Well... It's free.)
Generally though we don’t recommend building multiple apps for a single business (similar to a website, 1 app per business is usually good & less confusing)
If you want to build apps for clients, the PRO version will give you the ability to manage all your clients under 1 login (and then you can charge your clients anything you want to build the app / manage it / update it :)
In addition, as a pro user you’ll also get 40% commission on any clients that upgrade from free to pro, though they’re more than welcome to start on the Free Version.
Hope that answers your question!