Free olympiad practice that started as
a dad's HTML file.
OpenOlympiad is a growing free practice library for IMO, NSO, iOM, and iOS olympiad prep — built by a parent, refined by teachers, used by hundreds of students. The whole thing stays free. Donations keep it that way.
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.
The catalog is growing.
And it's growing — every week we add new questions, refine explanations, and extend coverage. Teachers can contribute directly (more on that below).
Contribute questions. Earn badges. Keep your students drilling.
Sign up with your school email. Add questions to topics you teach. Hit milestones and get contributor badges visible on your profile. Your students see fresh material every week.
🏅 Contributor milestones
- 🥉 First question contributed → Bronze
- 🥈 25 questions → Silver
- 🥇 100 questions → Gold
- 🚀 250 questions → Platinum
- 🏆 500 questions → Founder's Circle
🏫 How school whitelisting works
- One teacher signs up with their school email.
- The school's domain is auto-claimed; they become the school admin.
- Other teachers from the same domain auto-join.
- Teachers create groups, share invite links, monitor progress.
Want to onboard officially? Use the contact form so we know you're coming and can help with first-week setup.