Cant
Pick the better option, learn the pattern
01
One hub, a dozen games
The Can't Hub collects the whole series in one place, from React APIs over Git, SEO, testing and UX to chemistry.
02
Two options. One is better.
Every round shows two real implementations side by side with Shiki-highlighted code. You pick, you commit, and only then it resolves.
03
The why, not just the what
Each answer comes with an explanation of the pattern behind it, so the lesson transfers to the next code review instead of staying in the quiz.
Why it exists
Code reviews kept surfacing the same avoidable mistakes, and explaining them one comment at a time does not scale. Cant turns those recurring decisions into a game: two options side by side, one is better, and the why sticks with you longer than any review comment.
About this project
Cant started as Can't Maintain, a quiz that trained your eye for durable React component APIs. It grew into a whole series: a dozen side-by-side learning games where you pick the better of two options and learn why. The lineup now spans React APIs, TypeScript, Git, SEO, testing, UX, container orchestration, and even chemistry, all under one roof.
Tech Stack
From the blog
Responsive Design Has a Teaching Problem
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