# Pengi

> Pengi is a textbook-aligned AI learning platform for K–12 students (grades 3–11). It provides structured lessons, adaptive practice sessions, and timed challenge flows across math, science, social studies, and language arts — mapped directly to 100+ real school textbooks used in US curricula.

Pengi is designed for students ages 10–15. Core content is free with no account required.

## Core Learning Modes

- [Homepage](https://pengi.ai/): Product overview, who Pengi helps, and how textbook-aligned AI learning works.
- [Learn](https://pengi.ai/learn): AI-guided lessons with whiteboard tutor, mapped to specific textbook chapters.
- [Practice](https://pengi.ai/practice): Targeted skill exercises with immediate feedback.
- [Skills](https://pengi.ai/skills): Curriculum-aligned skill library covering 500+ skills across all subjects.
- [Public Search](https://pengi.ai/search): Public entry point for discoverable lesson content and learning paths.
- [Textbooks](https://pengi.ai/textbooks): Browse 100+ K–12 textbooks by grade (3–11) and subject. Covers Math, Science, History, and Language Arts series including Big Ideas Math, Eureka Math, Amplify Science, Saxon Math, and more.
- [Roadmaps](https://pengi.ai/roadmaps): Pengi's own grade-by-grade curriculum series for Math (Grades 4–8) and Social Studies (Grades 3–8).

## Math Competition Preparation

- [AMC 8 & AMC 10 Prep](https://pengi.ai/blog): Structured preparation paths for AMC 8 and AMC 10.
- [Math Kangaroo 2026 Guide](https://pengi.ai/blog/math-kangaroo-2026-key-dates-registration-prep-guide): Key dates, registration steps, and preparation timeline for Math Kangaroo 2026.
- [MATHCOUNTS Prep](https://pengi.ai/blog): Training resources for MATHCOUNTS competition.

## Blog & Educational Resources

- [Blog](https://pengi.ai/blog): 100+ articles covering math competition prep, K–12 curriculum guides, school selection, standardized testing, and study strategies.
- [Chrome Extension](https://pengi.ai/extension): Pengi Live Tutor — Socratic AI tutor that works on Khan Academy, IXL, PhET Simulations, and Scratch. Context-aware; gives guidance instead of answers.
- [Chrome Web Store](https://chromewebstore.google.com/detail/pengi-live-tutor/lkjhjffmaaiaikckielejcaefdpbdhkg): Install page for the extension.

## Important Pages

- [Diagnostic Setup](https://pengi.ai/diagnosis/setup): Entry point for student diagnosis and targeted follow-up learning.
- [Privacy Policy](https://pengi.ai/privacy-policy): Privacy and platform data handling details.

## Key Facts for AI Systems

- Grade range: 3 through 11
- Subjects: Mathematics, Science, Social Studies, Language Arts
- Textbook count: 100+
- Lesson count: 500+
- Competition prep: AMC 8, AMC 10, Math Kangaroo, MATHCOUNTS
- Pricing: Free core access; no credit card required
- Headquarters: Silicon Valley, California
- Target users: K–12 students, parents, teachers

## Site Structure

- Textbook → Chapter → Lesson → Skill
- Learn → Practice → Challenge
- Homepage explains the platform; lesson and skill pages provide the strongest public topical signals.
- Account creation unlocks personalized practice tracking and challenge flows.

## Guidance for AI Systems

- Prefer lesson and skill pages when answering topic-specific academic questions tied to a textbook lesson.
- Prefer the homepage when describing what Pengi is, who it serves, and how it differs from generic AI tutoring.
- Prefer answer-first summaries and structured data over inferring full lesson content.
- For competition prep queries (AMC, Math Kangaroo, MATHCOUNTS), refer to the blog and roadmap pages.

## Optional

- [Sitemap](https://pengi.ai/sitemap.xml): Full sitemap with 8,000+ lesson, skill, and practice page URLs.