I'm building designobo, a very fast ai prototyping tool. It let's you create and compare html prototypes in an infinite canvas. There's also a full css editor if you want to manually edit styles.
You can also connect any coding agent that supports MCP, so that you can use your own AI subscription.
This is an SSR app powered by datastar. I use CQRS and html patches with brotli compression to stream updates to the client.
I built designobo because I was tired of every single web app of this style being extremely slow and sluggish to use. I think this one is a bit better.
Let me know if you like it!