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CK-12

CK-12

Free and customizable K-12 STEM educational content and interactive tools.

softwareOnline LearningSTEM EducationInteractive SimulationsAdaptive Practice
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Our Verdict

Best for

K-12 educators and students seeking free, customizable STEM resources.

Skip if

You need extensive humanities subjects or lack reliable internet access.

What is CK-12?

CK-12 is a non-profit organization dedicated to increasing access to educational materials through its flexible, customizable web-based platform. It provides high-quality digital textbooks, simulations, and practice exercises primarily focused on science, technology, engineering, and mathematics (STEM) subjects. The platform empowers teachers to tailor content to their specific curriculum needs while offering students personalized learning experiences through adaptive practice tools and interactive modules. By leveraging open-educational-resource (OER) principles, CK-12 makes comprehensive learning resources accessible to classrooms worldwide without subscription costs.

SpecificationsAI-estimated

deploymentCloud/SaaS
open source❌ No
api available❌ No
support optionsHelp Center, Email Support
key integrationsGoogle Classroom, Canvas

Key Features of CK-12

FlexBooks 2.0 allows educators to edit, remix, and publish customized digital textbooks tailored to their specific curriculum.
The adaptive practice system dynamically adjusts question difficulty based on student performance to optimize learning.
Simulations and PLIX (Play, Learn, Interact, Xplore) modules provide visual, interactive explorations of complex math and science concepts.
Teachers can assign practice exercises, track student progress, and view detailed analytics dashboards within virtual classes.
The platform integrates with major Learning Management Systems (LMS) like Google Classroom and Canvas for seamless assignment workflows.
Built-in spelling and translation tools help support diverse learners and English language learners across various subjects.

Use Cases for CK-12

1

Curriculum Customization

Teachers rewrite and adapt standard textbooks to match their specific state standards and teaching styles.

2

Adaptive Homework

Students complete personalized math and science practice sets that adapt to their current skill level.

3

Remote STEM Learning

Educators utilize interactive online simulations to demonstrate physics and chemistry experiments virtually.

4

Classroom Management

Instructors create virtual classes to distribute assignments and monitor individual student performance metrics.

Pros & Cons of CK-12

Pros

  • Completely free for students and educators
  • Extensive library of customizable STEM content
  • Interactive simulations enhance conceptual understanding
  • Seamless integration with Google Classroom

Cons

  • Limited availability for non-STEM humanities subjects
  • Interface can occasionally feel overwhelming due to the sheer volume of resources
  • Relies heavily on a stable internet connection for interactive features

Frequently Asked Questions

Is CK-12 really free?

Yes, all CK-12 resources, including digital textbooks, simulations, and practice tools, are completely free for students and teachers.

Can teachers edit the textbooks on CK-12?

Yes, educators can use the FlexBooks platform to modify, reorganize, and add their own content to existing books.

Does CK-12 integrate with Google Classroom?

Yes, teachers can easily share CK-12 assignments, readings, and assessments directly into Google Classroom.

What subjects does CK-12 primarily cover?

CK-12 primarily focuses on K-12 mathematics and science subjects, though some social studies and other resources are available.

Pricing Overview

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Free

Detailed plans are not listed. Visit the official website for pricing information.

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About the Tool

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Platforms
WebiOSAndroid
Target AudienceK-12 teachers, students, and homeschoolers

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Tags

STEM EducationInteractive SimulationsAdaptive PracticeOpen Educational ResourcesDigital Textbooks

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