It offers automatic SSL for unlimited custom domains and subdomains through dedicated reverse proxy clusters. Each comes with a dedicated anycast IP address so that your users can point an apex A record at it and be geo routed to the nearest region of your cluster.
You can add virtual hosts for domains, subdomains, or specific paths through a really simple API and it'll handle SSL and verification automatically in a few seconds during the first request.
It's been really fun to work on, plenty of hard problems to solve and it's been really useful to people, including myself. I had a baby boy this summer so I've had roughly zero time to market it in any way but there's still tens of thousands of domains running through approximated clusters now so it's been growing a little bit at a time on its own.
Current future plans are for edge caching (nearly done), ddos mitigation, and then hopefully something more interesting like colocating serverless workers or distributed apps maybe.