Limit on custom subdomain?

Hi there, I had a question regarding the creation of subdomains from my domain name. I essentially want to create separate apps for clients. I already have a domain connected to my main website on softr let’s say
I want for each client of mines to have their profile on a separate subdomain. Example:, etc. Is it free to create unlimited apps using my domain as a subdomain? Or do I have to upgrade to pro and purchase custom domains at I believe 13/mo? For every app I make for my clients? How does pricing work in regards to custom subdomains? Essentially the same way we can create unlimited apps on the subdomain could it be done with a custom domain?

This article might solve your issue: Add a Custom Subdomain to Your App – Softr Help Docs