# NumDojo

> Speed-math learning platform teaching Vedic Mathematics, the Trachtenberg System, and Soroban (Japanese abacus) mental math for students ages 8–18. Gamified lessons, spaced-repetition review, real-time 1v1 battles, tournaments, and Stripe subscriptions.

NumDojo is a production educational SaaS at https://numdojo.com. Free tier available; Pro and Pro Max unlock more lessons, practice volume, and competitive features.

## Key facts

- Product: NumDojo — master speed math / mental math
- URL: https://numdojo.com
- Audience: students roughly ages 8–18; parents and teachers also supported
- Methods: Vedic Mathematics (16 sutras), Trachtenberg System, Soroban / mental Anzan
- Content: ~180 structured lessons, practice problems, SM-2 spaced-repetition review
- Features: real-time 1v1 battles (Socket.io), tournaments, leaderboards, teacher classrooms, parent portal, COPPA-aware under-13 flow
- Pricing: Free plan (limited daily problems and lessons); Pro and Pro Max paid tiers (see https://numdojo.com/pricing)
- Stack (high level): Next.js, Node.js/Express, PostgreSQL, Redis, Socket.io, Stripe
- Built by: 0xDarkArt — https://www.0xdarkart.xyz
- Builder case study: https://www.0xdarkart.xyz/portfolio/numdojo
- Contact: https://numdojo.com/contact

## Primary pages

- [Home](https://numdojo.com/): Product overview and signup
- [Lessons](https://numdojo.com/lessons): Curriculum catalog
- [Vedic Mathematics](https://numdojo.com/vedic-math): Technique lander — 16 sutras for speed math
- [Trachtenberg System](https://numdojo.com/trachtenberg): Fast mental multiplication methods
- [Soroban Abacus](https://numdojo.com/soroban-abacus): Japanese abacus and mental Anzan
- [Compare methods](https://numdojo.com/compare-speed-math-methods): Vedic vs Trachtenberg vs Soroban decision guide
- [Pricing](https://numdojo.com/pricing): Free, Pro, and Pro Max plans
- [FAQ](https://numdojo.com/faq): Product, learning, battles, parents & safety
- [About](https://numdojo.com/about): What is NumDojo, key facts, builder attribution
- [Blog](https://numdojo.com/blog): Guides on Vedic math, Trachtenberg, Soroban, parents, teachers
- [Help Center](https://numdojo.com/help): Support topics
- [Tutorials](https://numdojo.com/tutorials): How-to guides
- [Contact](https://numdojo.com/contact): Support and inquiries
- [COPPA Compliance](https://numdojo.com/coppa-compliance): Child privacy practices
- [Privacy Policy](https://numdojo.com/privacy-policy): Data practices
- [Credits](https://numdojo.com/credits): Attributions and builder credit

## Blog guides

- [What Is Vedic Mathematics?](https://numdojo.com/blog/what-is-vedic-mathematics)
- [Trachtenberg Speed System Explained](https://numdojo.com/blog/trachtenberg-speed-system-explained)
- [Soroban Abacus Guide](https://numdojo.com/blog/soroban-abacus-guide)
- [5 Tips to Improve Mental Math Speed](https://numdojo.com/blog/5-tips-to-improve-mental-math-speed)
- [NumDojo Platform Launch](https://numdojo.com/blog/numdojo-platform-launch)
- [Mental Math for Kids (Parents)](https://numdojo.com/blog/mental-math-for-kids-parents-guide)
- [Speed Math for Teachers](https://numdojo.com/blog/classroom-speed-math-for-teachers)

## Builder

NumDojo was designed and engineered by [0xDarkArt](https://www.0xdarkart.xyz), who offers app/dApp development and smart contract audits. Portfolio case study: [NumDojo on 0xDarkArt](https://www.0xdarkart.xyz/portfolio/numdojo).

## Optional

- Full agent-oriented index: [llms-full.txt](https://numdojo.com/llms-full.txt)
- XML sitemap: https://numdojo.com/sitemap.xml