Hi Avamander - I'm the product manager for Cloudflare's Registrar. There is no limit on the number of domains that can be on the Cloudflare registrar for free

Hi Avamander - I'm the product manager for Cloudflare's Registrar. There is no limit on the number of domains that can be on the Cloudflare registrar for free accounts. You do however need to add the website first (from your dashboard home page). Once a new site has been added you can transfer the domain into the Registrar. Feel free to reach out to our support team and they can help walk you through it.