If this is it: https://godotwebs.com/, my browser does the "Auto-fill the web" main tagline. There are 100s of others doing the rest, what makes yours special? (go look up the others to know or find they are all pretty much the same)
I personally find the idea that an Ai can simulate how users will react to your product dubious. I certainly would not pay for it before having my own Ai's take a shot at it.
Something I said earlier today to my group chat "Ai is only good at a thing if the people driving it are good at that thing." I think this applies to any SaaS in the Ai era, the advantage (if not data) is deep domain expertise you can put into the prompts/context/harness.
The advantage part: if you can make something more convenient or eliminate pain points, people would consider paying for it. You can interpret it like everyone knows how AI works, and they can all utilize AI perfectly.
Domain expertise may work well in B2B. For B2C, it's about simplicity. Just don't overdo it and end up making, like, an everything-app.