A 6th-grader, his dad, and one HTML file.
A nerdy dad sat down one weekend and built a small HTML page for his son — Class 6, preparing for the IMO and NSO. He pair-programmed with Claude Code over a few late nights. Just chapters, concepts, a few hundred questions. Nothing fancy. Just enough to drill.
The kid started using it. Then he showed it to a friend. Then to a few more. Soon their teacher noticed and asked if she could try it with her class. She came back with a list: “can you add hard-tier? mock papers? a way to track who's done what?”
One feature at a time, the project grew. More teachers wanted in. More schools asked. The dad and Claude Code kept building, the students kept solving. You're reading the result.
OpenOlympiad is free, ad-free, and open-access. If it's helped your child or class, the best thing you can do is tell your school.