I built interactive playgrounds where AI helps you build real applications

How it all started A few years ago, I created RustInsight. It was a set of step-by-step Rust courses where the reader built an application by following instructions — kind of like assembling a LEGO set. You’d go step by step, adding code to source files, and that’s how you learned Rust. At the same time, the application was being built as you progressed, so you could always see what the final result should look like and compare it with your own work. In the end, you didn’t just learn — you practiced and got a real, working application, like a microservice. The downside was that if you made a mistake, you had to debug it yourself (though diffs sometimes helped). Why I still believe in this idea I still think the core idea was right. People don’t really learn by endlessly watching videos or reading articles — they learn by building things with their own hands. RustInsight brought me my first customers. People actually needed this. But it was also my first serious launch, and I didn’t do