Practice math. Beat the clock.
OpenMath is a friendly math-practice app for primary-school kids — 24 quiz types, badges, and real-time multiplayer, in Hungarian and English. A real product, built in public on a sovereign cloud.
Why kids love it
Practice that feels like play
Beat the clock
Every session is timed. The goal is simple: the highest score in the least time.
Instant feedback
Right or wrong is shown immediately, with the correct answer — so practice actually sticks.
Badges & progress
Earn badges, build streaks, and watch accuracy and speed climb over every session.
Real-time multiplayer
Race classmates live — a lobby, a 3-2-1 countdown, and a podium at the finish.
Hungarian & English
Fully bilingual — the whole app and every quiz works in Hungarian and English.
Beautiful math
Fractions and expressions are rendered cleanly with KaTeX, just like a textbook.
Made for kids — loved by teachers & parents
OpenMath has a role for the whole learning circle.
Kids
Short, timed quizzes that feel like a game — with badges, streaks and a podium to chase.
Teachers
Group your class, set quizzes, and see who needs a hand — in Hungarian or English.
Parents
Follow your child’s progress and get a gentle nudge when they hit a milestone.
24 quiz types · 6 topics
A quiz for every skill
From adding within 20 to fractions — aligned with the primary-school curriculum, and always growing.
Arithmetic
Addition and subtraction within 20 and 100, round tens, and two-digit ± one-digit.
5 quizzes
Multiplication & division
Times tables, division with and without a remainder, doubles, and sums of products.
5 quizzes
Counting patterns
Continue the sequence — counting by 2s and by 5s.
2 quizzes
Roman numerals
Read and write Roman numerals, both directions.
2 quizzes
Measurement
Unit conversions and adding lengths.
3 quizzes
Fractions
Basic fractional arithmetic, rendered beautifully with KaTeX.
1 quiz
Collect every badge
Speed, accuracy, consistency and mastery — there’s a badge for each.
How it's built
OpenMath is also a real-world lab for running software in production — edge TLS, private networking, observability, and an on-prem AI roadmap. See the architecture →
The story
A dad building a real product to help his 3rd-grader meet computers — funded the “family, friends & fools” way, and shared openly. Read the story →