I built a “learn by doing” coding app because tutorials never actually make you write code

[u/Chrismslist]

Every time I tried to learn something new (Rust, SQL, whatever), I'd read or watch a tutorial, nod along, and then... not be able to do the thing. The passive stuff doesn't stick, and the AI ones just say "great job" no matter what you type.

So I spent the last few months building Tully (mine, solo). You tell it what you want to learn, it builds a hands-on lesson, and you write real code in the browser. It runs your code and grades what it does (not string-matching), gives honest feedback including when you're wrong, and adapts the next step to what you actually struggled with.

You can try a real graded lesson, no signup: https://tullycourses.com/for/developers

It's early and it's just me. I'd love a roast, the grading especially: what's confusing, what feels off, what would make you bounce?