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.
5quizzes
Multiplication & division
Times tables, division with and without a remainder, doubles, and sums of products.
5quizzes
Counting patterns
Continue the sequence — counting by 2s and by 5s.
2quizzes
Roman numerals
Read and write Roman numerals, both directions.
2quizzes
Measurement
Unit conversions and adding lengths.
3quizzes
Fractions
Basic fractional arithmetic, rendered beautifully with KaTeX.
1quiz
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 →