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ck12

ck12.org

ck12 is a service for Free Online Textbooks, Flashcards, Adaptive Practice, Real World Examples, Simulations. It highlights CK-12 Foundation provides a library of free online textbooks, videos, exercises, flashcards, and real world applications for over 5000 concepts from arithmetic to history

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Availability: Active
Pricing: Unknown
Registration: Unknown

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API-provided profile · Submitted by a trusted data editor

API · Sep 17, 2026

Key features

Free Online Textbooks
Flashcards
Adaptive Practice
Real World Examples

Similar sites

wikipedia

wikipedia.org

OfficialUnknownEducation & Research

Simulations

CK-12 Foundation provides a library of free online textbooks

exercises

Public homepage: ck12.orgProvider check date: Sep 17, 2026

Site type

Website

Platforms

WEB

Audience

CONSUMER

Service regions

GLOBAL

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ck12.orgCANONICAL

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Facts

Availability: Active
Safety: Unknown
Canonical address: https://ck12.org/
Primary language: en
Country: Global
Language: English
Pricing: Unknown
Registration: Unknown
Last checked: Sep 17, 2026
Last AI review: Sep 17, 2026

Organization

Unknown

Service regions: GLOBAL

Sources

Pending

Change history

Sep 17, 2026

khanacademy

khanacademy.org

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edx

edx.org

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ocw.mit

ocw.mit.edu

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ck12