Juanjo Valiño is an iOS developer from Galicia, Spain who left a six-year salaried job to build his own products full time. After shipping more than fifteen small apps, he kept rewriting the same plumbing every time: authentication, onboarding, paywalls, in-app purchases, analytics, and the backend code needed to call AI APIs without exposing keys. Instead of accepting that as the cost of doing business, he packaged all of it into a SwiftUI boilerplate aimed at people building AI wrapper apps, and named it WrapFast.

He put WrapFast up for sale in March 2024 priced as a one-time purchase. The first day brought in about $750, which told him the pain he had felt across his own projects was widely shared. He kept building in public on X and on livestreams, selling the boilerplate to other indie iOS developers while using it himself to ship new apps.

The breakout came in December 2024. Earlier that month he ran a self-imposed "7 days, 7 apps" challenge, building AI identifier apps live on stream using WrapFast the whole time. The challenge doubled as a demo: every app he shipped was proof the boilerplate worked. It happened to land over Black Friday, so boilerplate sales jumped, and he climbed into the top five of the ShipFast affiliate leaderboard. He also listed several of the challenge apps for sale and landed the first order for a new productized service building AI identifier apps to spec.

Stacked together, those sources pushed him past $15k for the month, roughly quadrupling his previous best of about $4k. He was candid in his newsletter that the mix felt close to freelancing and not quite the app-revenue freedom he was chasing, but he framed it as a foundation that bought him time to keep building. The honest takeaway is that the headline number was a blended one-off peak, not recurring revenue, and he said so himself.

What makes the story repeatable is the underlying move: he sold the tool that made his own work faster, and he marketed it by doing the work in public. Dogfooding WrapFast on stream removed the usual gap between a sales page and a working demo, because the audience watched the product ship real apps in real time.