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CK-12 Foundation

Smarter Learning. For Free.

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Overview

The CK-12 Foundation is a non-profit organization dedicated to increasing access to high-quality K-12 education. It provides a rich library of free online content, primarily in STEM subjects, including digital textbooks (FlexBooksยฎ), concept-based learning modules, simulations, and adaptive practice. All resources are customizable and free for students and educators.

โœจ Key Features

  • Completely free
  • Customizable digital textbooks (FlexBooksยฎ 2.0)
  • Interactive simulations and PLIX interactives
  • Adaptive practice technology
  • Strong focus on STEM subjects

๐ŸŽฏ Key Differentiators

  • Customizable FlexBookยฎ textbooks
  • High-quality interactive simulations
  • Strong focus on concept-based learning

Unique Value: Empowers educators and parents to create and customize high-quality, interactive STEM learning experiences for free.

๐ŸŽฏ Use Cases (4)

Free homeschool curriculum, especially for STEM Supplementing other curricula with interactive content Creating custom digital textbooks Adaptive skill practice

โœ… Best For

  • Free, customizable K-12 STEM resources

๐Ÿ’ก Check With Vendor

Verify these considerations match your specific requirements:

  • Families seeking a comprehensive, pre-packaged curriculum for humanities or language arts
  • Users who need a structured, day-by-day lesson plan for all subjects

๐Ÿ† Alternatives

Khan Academy Easy Peasy All-in-One Homeschool

Unlike Khan Academy's video-focus, CK-12's core strength is its customizable digital textbooks and interactive simulations.

๐Ÿ’ป Platforms

Web iOS Android

๐Ÿ”Œ Integrations

Google Classroom Canvas Schoology

๐Ÿ›Ÿ Support Options

  • โœ“ Email Support

๐Ÿ”’ Compliance & Security

โœ“ GDPR โœ“ SSO โœ“ COPPA โœ“ FERPA

๐Ÿ’ฐ Pricing

Contact for pricing
Free Tier Available

Free tier: All content and tools are free.

Visit CK-12 Foundation Website โ†’