About C:Math

Last updated: 2026-05-29

1. Mission

C:Math gamifies math practice across six domains — matrix, vector, arithmetic, geometry, statistics, and probability — for Korean and English learners alike. The service is free to use, requires no signup for basic practice, and offers an optional account for progress tracking and leaderboard participation. Our goal is to make linear algebra and statistics feel approachable, like playing a game with immediate feedback rather than grinding through a textbook. Every problem is generated procedurally, graded in real time, and accompanied by an explanation so that practice always doubles as learning.

2. Who Built C:Math

C:Math was created by skskdustn as a hobby project that grew into a public learning tool. The author is a software engineer and math enthusiast who wanted a place to practice the topics that come up most often in undergraduate coursework and engineering interviews. The site is currently maintained as a side project and is not affiliated with any educational institution, publisher, or testing body. For direct contact, email rin238238@gmail.com.

3. What Makes C:Math Different

Three things set C:Math apart from generic worksheet generators. First, real-time grading is backed by HMAC payload signing, which means client-side scores cannot be forged before they reach the server. The anti-cheat layer keeps the global leaderboard honest without forcing users into invasive proctoring or screen recording, so casual learners and competitive players can share the same board. Second, every problem ships with a step-by-step solution explanation, not just a correct/incorrect verdict. You see why an answer works, which row reduction step matters, which probability identity applies, and where common mistakes happen — turning each wrong answer into a worked example rather than a dead end. Third, C:Math is genuinely bilingual EN+KO with ten-language UI support. Math notation, problem text, and explanations are authored in both Korean and English by a bilingual maintainer, not machine-translated at the chrome level. Eight additional UI locales (Japanese, French, German, Spanish, Portuguese, Italian, Dutch, Simplified Chinese) cover navigation and settings so the experience stays consistent for international visitors.

4. Tech Stack

This section is informational, aimed at engineers and students who care about how the site is built. The frontend is Astro 5 with the static output adapter, mixed with selective interactive islands. All new code is TypeScript with strict mode enabled, including noUncheckedIndexedAccess. State is managed with nanostores rather than global window variables. The backend runs on Netlify Functions against a Supabase PostgreSQL database. Authentication uses bcrypt one-way hashing for passwords and security answers, and HMAC payload signing protects scoring submissions. The test layer combines Vitest for unit and golden tests with Playwright for end-to-end browser flows. Hosting is on Netlify; the domain is c-math.net. Source references here are descriptive only — there is no public repository link at this time.

5. Learning Philosophy

C:Math is built on a few opinionated beliefs about how math practice should feel. Active practice beats passive reading: solving a problem you almost get right and then reading why teaches more than watching ten videos. Spaced repetition emerges naturally through gamification — combo bonuses and topic variety push you to revisit weaker areas instead of grinding the comfortable ones. Mistake tolerance is treated as a feature, not a bug: wrong answers come with an explanation, not a penalty screen. And bilingual reinforcement matters — seeing the same problem in Korean and English side by side helps both math intuition and language acquisition at the same time.

6. How to Use C:Math

Getting started takes about a minute. Open the site, choose a topic from the six services — Matrix, Vector, Arith, Geo, Stat, or Prob — and start solving problems. Each problem is graded the moment you submit, with a worked solution available on demand. For deeper background on individual topics, visit the docs section. If you want to save progress, climb the global leaderboard, or sync across devices, create an optional account from the settings menu. The account flow only asks for an email, a display name, and a password.

7. Roadmap (brief)

C:Math is a hobby project; ship cadence is best-effort, not contractual. Near-term priorities are:

• Q3 2026: TypeScript migration of Netlify Functions (Phase 6 of the internal refactor plan).
• Q4 2026: Full Korean URL localization under /ko/... with proper hreflang coverage.
• Later: Additional topic domains — calculus and discrete math are the leading candidates.

8. Acknowledgments

C:Math stands on open-source shoulders. Astro, TypeScript, nanostores, Supabase, Vitest, and Playwright power most of the stack. Math content is original and generated procedurally rather than scraped from textbooks. The icon set is inline SVG to keep the bundle small and the styling theme-aware. Typography uses Inter and JetBrains Mono served through Google Fonts. Thanks to every contributor and every learner who has filed a bug report or suggested a problem variant.

9. Contact

For bug reports, content corrections, partnership inquiries, or just to say hello, email rin238238@gmail.com. Responses are best-effort within seven days. See the Contact page for more channels and the right address per topic.