For free.
For free.
We, at CK-12, believe every child on this planet should have equal access to great education.
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The latest from CK-12

Simulations, PLIX, and Adaptive Practice

We’re raising the bar with interactive learning activities and practice that adapts to individual student performance.

2013

Classes

Teachers assign concepts to students and track their performance in CK-12 classes. Students can join their classes and receive assignments from their teacher.

2012

Concept-based Learning.

Content is broken down and presented in multiple modalities to fit different learning styles.

CK-12 on all devices.

Access CK-12 on your desktop, tablet, or mobile phone.

2011

Concept Collections

FlexBook® textbooks are deconstructed into bite-sized chunks of information.

2010

Teacher Editions

FlexBook® textbooks are extended with workbooks, quizzes, and tests with corresponding answer keys.
Access CK-12 anytime and on-the-go.

2008

FlexBook® Textbooks Launch

CK-12 launches fully customizable Math and Science textbooks that are free for the world to download or view online.

2007

CK-12 was born

A small, yet talented group of people vow to make receiving a great education accessible to all.