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Practice olympiad-style math problems and compete against other users.
Optimize coding productivity with the world’s best assistant

Website, pricing, platforms and company facts side by side.
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| Website | calcora.net | code.lobby.so |
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| Company | Startup from Switzerland · 1 - 9 employees · 2026 | — |
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In their own words, as submitted to SaaSHub.

Calcora is a free platform for practicing math problems of all difficulty levels. Solve problems, maintain your streak, and compete with friends on the leaderboard. The Rules No Calculator. Solve every problem by hand. Mental math and working on paper are part of the challenge. No AI Assistance....
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When comparing Calcora.net and Lobby Code, you can also consider the following products.

Brilliant - Understand concepts and build your problem solving skills with thousands of free problems and examples in math, science, and engineering.
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Improve math skills with ranked practice, Elo-style ratings, topic lessons, timed challenges, progress stats, rewards, and a global leaderboard.
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Khan Academy offers online tools to help students learn about a variety of important school subjects. Tools include videos, practice exercises, and materials for instructors. Read more about Khan Academy.
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Complete and climb the global math leaderboard on Numberthon! Key features include ranked math matches, puzzles, and ELO style rankings.
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Project Euler is a series of challenging mathematical/computer programming problems that will...
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Practice and level up your development skills and prepare for technical interviews.
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