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  • Add-ons
  • SIS Integration

CK-12 offers a free, top-tier learning platform with interactive digital textbooks and Flexi, an AI student tutor and teacher assistant.

App details


CK-12 Foundation

Subject area

Mathematics, Science



Age/Grade Range

K-5, 6-8, 9-12, Higher ed, Admins/staff, Educators



Features and integrations

Key features

  • Ask Flexi, CK-12's personal AI student tutor and teacher assistant.

  • Learn through FlexBooks┬« 2.0, an intelligent platform with multi-modal resources.

  • Practice with CK-12's 150,000+ questions that adapt to student performance.

  • Explore through Simulations, PLIX (Play. Learn. Interact. eXplore.), and other interactives.


  • Add-ons

  • SIS Integration

  • Classroom API: CourseWork

  • Classroom Share Button

  • Google Workspace Add ons

  • Identity Integration: Google Single Sign-On (SSO)

  • Classroom API: Rostering



Explore more resources to get you started.

Using CK-12 with Google Classroom

An overview of assigning CK-12 resources, completing student work, and seeing progress through Reports & Insights to or within Google Classroom.

Overview of CK-12 Resources

An overview of CK-12's free resources for students, parents, teachers, schools, and districts.

Testimonials of CK-12 Educators & Students

CK-12 users, including educators and students, share in video and text how CK-12 meets their various needs.

The Latest from CK-12 on Our Blog

Hear from educators and the team at CK-12 about leveraging our platform, the latest features, and more.

Teaching resources

Find resources that were tailor-made for teachers.