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Side note: is there an AI app that sets up a full initial SaaS app based on prompts? I'm struggling to get something like Cursor to behave correctly.

Not exactly what you're asking but: have you tried some Boilerplate SaaS thing?

What products are in this space?

There are tons. You can look up "saas boilerplate $your_stack".

vibe coding oriented builders, where you draft an app idea and it gives you a prototype?

I'd say Firebase Studio and OpenHands