No catch. The feedback we get from this Show HN helps us improve and pays for itself.

But at some point you have to pay your GPT-4 bill, right? What’s the plan there?

I don't think they have a plan...

Just riding the hype and for someone else to upend them or will run out of cash when OpenAI increases their prices and will have to run back to VCs for more money.

Whichever comes first.

Indeed, would love a clarification from OP. But given the tool's apparent quality it's very likely that it'll be SaaS'd after a trial MvP run.

There will always be a free version.