I Rebuilt a $3 Billion App With Claude Fable 5 (Calendly)

Are you familiar with Cali, the scheduling app that half the internet uses to book call? Well, that's a company that's worth around $3 billion. And today, I'm going to model a version of it using Claude's newest model, Fable 5. And I'm going to add a diagnostic quiz built on top of the book a call

capability, which is actually something that Calendarly doesn't currently do. And by the way, this is quite ambitious. This is a kind of tool that used to take an entire funded dev team months to ship. So, I'm going to walk you through the process and show you the working finished app. You don't need a perfect

prompt to get something to work anymore. You can even sketch the idea on paper. Drop your photos in and brainstorm with Fable until you got a working prototype. I'm going to walk you through what Fable can actually do, the prompt I used. We're gonna build it live and I'm gonna explain the parts that you still have to

do yourself. So, let's get into it. Clothe mythos or Fable 5 is Claude's newest model and it's the most capable one yet. So, here's what changed. First, you don't need a sophisticated prompt anymore. You can get away with having a mediocre prompt. You can even sketch your idea on paper and drop the photos

in and Fable will brainstorm with you and come back with a working prototype. The other thing you can do is you can also hand it all your business data, your second brain if you will, such as your offer, who you serve, your methodologies, your emails from customers, anything you want, and you can ask it for different mini web ideas

worth building as lead magnets. And second, it's actually much faster and it does a better job handling design than it did previously. So that's the real shift. We can get faster from a rough idea to a working prototype. And even if you're not technical, I'm going to be modeling a booking tool that runs people