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CK-12 Foundation

CK-12 Foundation

4.65/5

CK-12 Foundation

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What is CK-12 Foundation?

CK-12 is an interactive and intelligent learning platform that's free for everyone.

Used by more than 200 million students and teachers worldwide, CK-12 empowers learners with high-quality content and cutting-edge technology.

FlexBooks® 2.0 technology enables students to learn in their own way - whether by reading, watching videos, exploring interactive simulations, or answering personalized practice questions with immediate feedback for both correct and incorrect answers.

Flexi the AI-powered tutor makes learning engaging and answers students’ science questions with interactive examples to help them understand the underlying concepts (coming soon for math). Flexi provides students with timely reminders of upcoming assignments, topics they may have forgotten or missed, their next topic to learn, and any unfinished work - helping them stay on track. Flexi helps students self-reflect to answer questions like: "How am I doing?", "How can I improve?", "What am I missing?"

Flexi empowers educators as well, providing every teacher with a digital assistant that uncovers student learning gaps and misconceptions, and offers personalized insights on where to intervene effectively. Flexi updates the grade book in your LMS as students turn in their work so that you can focus on teaching, and even helps assign auto-graded assignments to classes in Google Classroom, Schoology, and Canvas

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Educational Impact

improve teaching efficiency
89%
build student knowledge
87%
improve attainment
84%
reduce teacher workload
83%
CompanyHQ Location: United States
Founded: 2007
Age Range5-7, 8-10, 11-13, 14-16, 17-18, 19+
FeaturesTest PrepAssignmentsDigital TutorDashboardInstant FeedbackTeacher AssistantLms IntegrationPracticeStudy Help
LanguagesArabic, Chinese, English, French, German, Italian, Japanese, Korean, Spanish
AccessibilityModerate features
PoliciesTerms of ServicePrivacy Policy
RequirementsInternet - Low BandwidthInternet - High BandwidthDesktop - MacDesktop - WindowsDesktop - ChromebookMobile - iPhoneMobile - iPadMobile - WindowsMobile - Android

As long as you have a phone or laptop that can access the internet, you can use CK-12!

TrainingWebinars

Our platform is designed to be simple and intuitive - you can use it without any training. However, to help you get the most out of CK-12, we also host live webinars, provide on-demand webinars, and run a free certification program.

SupportEmailFAQs/Forum
Home LearningParent Access

Anyone can create the account.

CK-12 Foundation Pricing


Pricing Plans

Free Version

CK-12 Foundation pricing starts from $0 / year

CK-12 has no subscription, no advertising and no licensing to schools or users. Everything on CK-12 is 100% free – forever. Get in touch if you wish to make a donation.

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CK-12 Foundation Reviews

4.65 out of 5

from 33 Verified Reviews

CK-12 Foundation has collected 0 reviews in the past 6 months

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Average
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CK-12 Foundation
Fatime

English teacher

"Rexhep Voka", Macedonia, The Former Yugoslav Republic Of

Used CK-12 Foundation for 0–3months

Jan 2021

Every thing is clearly good

Fatime found CK-12 Foundation:
  • Significantly improves attainment
    Yo explain to my students everything in the poin of view like they want
  • Significantly builds student knowledge
    They are able to express everything
  • Slightly improves teaching efficiency and productivity
  • Significantly reduces teacher workload
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Connie

Science Teacher

Albuquerque High School, United States

Used CK-12 Foundation for 4-6 months

Dec 2020

CK-12 saves time and work for the teacher, provides the lessons in "bite-sized" chunks, is offered in several different languages, and appeals to students. The practice at the end of each section is invaluable.

Connie found CK-12 Foundation:
  • Significantly improves attainment
    They offer practice problems for each section, with automatic feedback to the students. Students continue until they have answered 10 questions correctly, or until they have reached the level of proficiency that they desire.
  • Significantly builds student knowledge
    See previous answer.
  • Significantly improves teaching efficiency and productivity
    Having automatic grading that is synced directly into Google Classroom.
  • Significantly reduces teacher workload
    see above
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Nancy Linsangan

Earth Science Teacher

Hickory High School, Chesapeake Virginia, United States

Used CK-12 Foundation for 4-6 months

Dec 2020

CK12 is amazing. Factual, concise and interactive -- what else could a Science teacher ask for!?!

Nancy Linsangan found CK-12 Foundation:
  • Significantly improves attainment
    My students have been able to acquire or attain information and understanding, of class topics, from the CK12 online flexbooks.
  • Significantly builds student knowledge
    Higher test scores
  • Significantly improves teaching efficiency and productivity
    I am able to assign work right from the CK12 application.
  • Slightly reduces teacher workload
    I can assign work from the CK12 application, but not from my school's LMS, Schoology. I have been waiting for a few weeks for a "secret key" (?).
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Gina D'Aquila

7/8 th science teacher

teacher, United States

Used CK-12 Foundation for 4-6 months

Dec 2020

i have told everyone i can

Gina D'Aquila found CK-12 Foundation:
  • Significantly improves attainment
    students love it
  • Significantly builds student knowledge
    lessons and videos
  • Significantly improves teaching efficiency and productivity
    help to keep continuity
  • Significantly reduces teacher workload
    dont have to search for hours to find material
  • Significantly saves school money
    free- hopefully stays that way
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Sara Turner

Science Teacher

Sequim Middle School, United States

Used CK-12 Foundation for 4-6 months

Dec 2020

I love the integrated simulations and videos in the CK12 chapters. It's an interactive textbook. I wish I had this when I was growing up.

Sara Turner found CK-12 Foundation:
  • Moderately improves attainment
    Full access online to updated content.
  • Moderately builds student knowledge
    I love the explore more option. I'm not sure if my students are actually using it, but it's there for them.
  • Moderately improves teaching efficiency and productivity
    CK12 is integrated into Canvas which has helped tremendously with grading efficiency.
  • Moderately reduces teacher workload
    Again, full integration into Canvas has helped to reduce teacher workload with grading.
  • Significantly saves school money
    Free program means more funding for other avenues. However, our textbooks were so extremely outdated that I'm not sure any money has been spent in that direction for a long time.
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Lisa Stritzel

teacher assistant w/substitute teacher license

Marion Unit 2: Longfellow Elementary School in Illinois, United States

Used CK-12 Foundation for 4-6 months

Dec 2020

I feel like ck12 is a great addition to teacher. In helping the students learn in a fun way as well educational way.

Lisa Stritzel found CK-12 Foundation:
  • Significantly improves attainment
    The kids feel like they are more engaged.
  • Significantly builds student knowledge
    They have improved their understanding content in varies subjects.
  • Significantly improves teaching efficiency and productivity
    The examples of the simulations and plix have helped with the teaching process in the classroom.
  • Moderately reduces teacher workload
    Do not have to individual go in and put in a grade. Which is nice.
  • Slightly saves school money
    No examples at this time on how school money is impacted.
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Dr. David Block

Teacher

Roosevelt HS, United States

Used CK-12 Foundation for 4-6 months

Dec 2020

Nice produce... AND FREE

Dr. David Block found CK-12 Foundation:
  • Significantly improves attainment
    nope
  • Significantly builds student knowledge
    the content and adaptive practice
  • Significantly improves teaching efficiency and productivity
    It's a well rounded product with reports on my students
  • Significantly reduces teacher workload
    See previous
  • Slightly saves school money
    Once I convince them to stop buying textbooks, it will save
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Jacob Kramer

High School Science Teacher

Rushford-Peterson High School, United States

Used CK-12 Foundation for 0–3 months

Dec 2020

I have greatly enjoyed using CK-12 in my Biology classroom. The website is user-friendly, is a great way for students to review material at their grade level, and offers fantastic formal and informal assessment opportunities.

Jacob Kramer found CK-12 Foundation:
  • Moderately improves attainment
    Students have additional practice with the material to strengthen their understanding of the material.
  • Significantly builds student knowledge
    Students can read lessons on concepts that they may struggle with at their own pace to gain a deeper understanding of the material. The adaptive practice is also a great way for students to test their knowledge and let them know if they need additional practice with the material.
  • Significantly improves teaching efficiency and productivity
    My school is currently on a hybrid model and CK-12 has been a great resource for the students on their days away from school. The material is still challenging for the students and a great way to strengthen their understanding of material we discussed in class or introduce them to concepts that we are going to discuss the next day they are in school.
  • Significantly reduces teacher workload
    The class reports feature is a great way to assess students' performance on a variety of assignments at a mere glance. The website is user-friendly for both myself and my students.
  • Significantly saves school money
    In the near future, I can see myself using CK-12 as a free virtual textbook for my Biology classes.
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Shon Holland

Middle school science lead

Dublin city schools, United States

Used CK-12 Foundation for 5 years+

Dec 2020

It’s an amazing resource that is engaging and gets straight to the point of what students need to know

Shon Holland found CK-12 Foundation:
  • Moderately improves attainment
    The interactive pieces that directly support what students have just read.
  • Significantly builds student knowledge
    They see a direct connection between the text, videos, and simulations to the real world.
  • Moderately improves teaching efficiency and productivity
    There aren’t 100 different sites to visit - it’s all self contained
  • Significantly reduces teacher workload
    Consistent layout, simple directions allow us to answer questions based on content and not on “where to find things”
  • Significantly saves school money
    Ck12 is free which allowed us to test it with no worry about “waisting money”
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Jennifer

Teacher

Las Cruces High School, United States

Used CK-12 Foundation for 4-6 months

Dec 2020

It is user friendly and yet it is engaging and employs lots of different activities as well as alignment for NGSS

Jennifer found CK-12 Foundation:
  • Moderately improves attainment
    Students had to keep taking the practice till they get 10 so it helps them see what is important and what they need to be getting from the assignments
  • Moderately builds student knowledge
    The simulations help them actively participate
  • Moderately improves teaching efficiency and productivity
    Students can use the CK12 without a teacher
  • Moderately reduces teacher workload
    CK 12 has lots in one spot
  • Significantly saves school money
    I have not had to ask my school for money
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Chriss O

Science Teacher

West Mifflin Area High School, United States

Used CK-12 Foundation for 4-6 months

Dec 2020

The materials that CK-12 supplies, FOR FREE!!!, are amazing. We are using it for Biology, Chemistry, Physical Science, Physics, Astronomy, and Zoology classes.

Chriss O found CK-12 Foundation:
  • Significantly improves attainment
  • Significantly builds student knowledge
  • Significantly improves teaching efficiency and productivity
    As this is my first year teaching remotely, there is no way I could develop the quality of content that is found in their platform.
  • Significantly reduces teacher workload
    I love that they provide short discreet lessons so that I can easily pick which ones match my curriculum the most. I have a CK-12 lesson for just about every topic that I need.
  • Significantly saves school money
    Our science department was supposed to get new textbooks this year but we did not due to the pandemic. Some of our books are close to 20 years old. CK-12 is definitely saving our district money and helping the teachers teach with up-to-date materials.
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Jaclyn

Chemistry teacher

Waterbury Public Schools, United States

Used CK-12 Foundation for 0–3 months

Dec 2020

I'm still getting to know the platform. It has a lot of promise and I'm excited to learn more, but I'm not going to push a platform unless I really believe in it and understand it.

Jaclyn found CK-12 Foundation:
  • Slightly improves attainment
  • Slightly builds student knowledge
  • Moderately improves teaching efficiency and productivity
    I like the integration with google classroom.
  • Moderately reduces teacher workload
    The grading from the practice questions is very helpful and I love the score reports for each student.
  • Slightly saves school money
    If I converted to flexbooks, I wouldn't need textbooks, but at this time we don't use ck-12 exclusively. I still need to review the flexbook to see if it is the right tool for me.
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Raylene Olinger

HS Science teacher

South Routt School District, United States

Used CK-12 Foundation for 4-6 months

Dec 2020

I think the resources are great.

Raylene Olinger found CK-12 Foundation:
  • Moderately improves attainment
    Highly engaging to students
  • Moderately builds student knowledge
    Focused lessons
  • Moderately improves teaching efficiency and productivity
    All materials in one place, easy to use with Google Classroom
  • Moderately reduces teacher workload
    Ease of use with Google Classroom
  • Moderately saves school money
    This resource being free has been a blessing
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Brooke

Biology Teacher

Fundación Liceo Inglés, Colombia

Used CK-12 Foundation for 1-2 years

Dec 2020

Well, 10 means I'm very likely to recommend it to someone else.

Brooke found CK-12 Foundation:
  • Slightly improves attainment
  • Significantly builds student knowledge
  • Significantly improves teaching efficiency and productivity
    The adaptive practice is personalized to the student and the data is easily accessible so I don't have to spend so much time grading or reinforcing individual students.
  • Significantly reduces teacher workload
    See last comment.
  • Significantly saves school money
    It's free...
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Nagaraja

Adviser

RIE Retired bio teacher, India

Used CK-12 Foundation for 0–3 months

Dec 2020

Knowledge base grows horrizantally and vertically

Nagaraja found CK-12 Foundation:
  • Moderately improves attainment
    Recent YouTube creation
  • Moderately builds student knowledge
    On DNA
  • Significantly improves teaching efficiency and productivity
    STEM content
  • Not reduces teacher workload
    More work and notes making
  • Slightly saves school money
    Not in touch with schools
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Greg

Parent

Homeschool, United States

Used CK-12 Foundation for 0–3 months

Dec 2020

I have told other homeschool parents to use it.

Greg found CK-12 Foundation:
  • Moderately improves attainment
  • Significantly builds student knowledge
  • Significantly improves teaching efficiency and productivity
    I can look at the assignments before my student completes them and keep up in my copy of the book just like regular books but I can have them on any device anytime.
  • Significantly reduces teacher workload
    I just let my student go through the work and check after.
  • Moderately saves school money
    I use it for History and Science and it's free. I would be paying for those in another program. The books are free and very well done.
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Diane

Science Teacher Middle School

Kanuikapono PCS, United States

Used CK-12 Foundation for 3-4 years

Dec 2020

Students enjoy using it because it's a combination of reading and video

Diane found CK-12 Foundation:
  • Slightly improves attainment
    It's difficult to determine attainment because there is no check-for-understanding. quiz or questions.
  • Slightly builds student knowledge
    The "A" students would do the work and retain the knowledge but the "C" and "B" students didn't
  • Slightly improves teaching efficiency and productivity
    It
  • Slightly reduces teacher workload
    I could not figure out how to verify that students finished their assignments with correct answers
  • Moderately saves school money
    My school is paying $80k for a different virtual curriculum that is challenging for my middle school students. They like CK12 better!
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Thomas Freeman

Science + Technology Teacher

East Tipp Middle School, United States

Used CK-12 Foundation for 1-2 years

Dec 2020

CK-12 has the potential to become the most widely-utilized digital textbook and science resource of the future. An open education environment that could rival Wikipedia in popularity.

Thomas Freeman found CK-12 Foundation:
  • Significantly improves attainment
    Students can use the material to review topics, use it as a textbook, and get more engaged using the simulations and PLIX.
  • Significantly builds student knowledge
    Students get a chance to learn new vocabulary and work towards mastery of a topic.
  • Significantly improves teaching efficiency and productivity
    CK-12 makes assigning mastery-based homework easy and makes it easy to access free learning resources anywhere.
  • Significantly reduces teacher workload
    The self grading mastery-based assignments make it easy for students to practice frequently and often without increasing the amount of manual grading.
  • Significantly saves school money
    All the resources are free online.
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Daniel

Teacher

Rawdah high school, Lebanon

Used CK-12 Foundation for 1-2 years

Dec 2020

very interesting, just not totally fits the lebanese cucrriculum

Daniel found CK-12 Foundation:
  • Moderately improves attainment
    real world, simulation
  • Moderately builds student knowledge
    rotation
  • Significantly improves teaching efficiency and productivity
    imbede quiz
  • Slightly reduces teacher workload
  • Not saves school money
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Casey Hackman

6th grade teacher

Cimarron Middle School, United States

Used CK-12 Foundation for 7–12 months

Dec 2020

With CK-12 being FREE and readily available, I am telling many about the resource.

Casey Hackman found CK-12 Foundation:
  • Moderately improves attainment
  • Significantly builds student knowledge
  • Significantly improves teaching efficiency and productivity
    When I want students to grapple with a concept, CK-12 has already done the research for a particular topic.
  • Significantly reduces teacher workload
    I can easily pull up a chapter and it supplements what I am currently teaching.
  • Significantly saves school money
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Brenda Graminski

Science Teacher

Platt Technical High School, United States

Used CK-12 Foundation for 7–12 months

Dec 2020

Brenda Graminski found CK-12 Foundation:
  • Significantly improves attainment
    Can be used on any device so more equal access
  • Moderately builds student knowledge
    The adaptive practice, and engagement with text.
  • Significantly improves teaching efficiency and productivity
    Scoring adaptive practice, quantifying engagement and grading quizzes.
  • Moderately reduces teacher workload
  • Moderately saves school money
    It's a free resource and easily accessible.
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Mohammed Ali Al Jaf

Physics Teacher & Supervisor

Al Bnouk Privet Shools, Iraq

Used CK-12 Foundation for 0–3 months

Dec 2020

I can't tell now.

Mohammed Ali Al Jaf found CK-12 Foundation:
  • Slightly improves attainment
    This is my first to join this masterclass
  • Slightly builds student knowledge
    I haven't attended any masterclass yet.
  • Slightly improves teaching efficiency and productivity
    I can't tell for sure.
  • Slightly reduces teacher workload
    I think so.
  • Slightly saves school money
    I can tell in the future.
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James Byrne

Science Teacher

Bayshore High School, United States

Used CK-12 Foundation for 4-6 months

Dec 2020

Since we went virtual and I teach E-learners full time, CK12 has been a Godsend. Students like the short, accessible lessons, and I like how I can spend time helping them instead of preparing online content

James Byrne found CK-12 Foundation:
  • Significantly improves attainment
    Students are in control of their learning
  • Moderately builds student knowledge
    Some students start to ask better questions
  • Significantly improves teaching efficiency and productivity
    I can spend less time planning online curriculum and more time assisting learners.
  • Significantly reduces teacher workload
    I can get a great report on how engaged students are and how well they understand the material
  • Not saves school money
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Crystal

middle school science and STEM teacher

David Thibodaux STEM Magnet Academy, United States

Used CK-12 Foundation for 5 years+

Dec 2020

CK-12 has been my "go-to" for over 5 years and it has only gotten better. Science content delivery has changed tremendously and I believe that CK-12 has the best model for delivery for today's science student.

Crystal found CK-12 Foundation:
  • Moderately improves attainment
    not now
  • Moderately builds student knowledge
    students use adaptive practice and simulations in addition to reading
  • Moderately improves teaching efficiency and productivity
    I use a hybrid teaching model and CK-12 has many useful options for me
  • Moderately reduces teacher workload
    adaptive practice works really well to help differentiate for students
  • Slightly saves school money
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Lizelle

Teacher of physics and chemistry

Bishops, South Africa

Used CK-12 Foundation for 4-6 months

Dec 2020

You’re excellent and I wish you could make all resources free to teachers worldwide.

Lizelle found CK-12 Foundation:
  • Significantly improves attainment
    Test scores improve
  • Significantly builds student knowledge
    Better understanding of concepts
  • Significantly improves teaching efficiency and productivity
    Good demos and exercises
  • Significantly reduces teacher workload
    Having good demos like CK12 available online, reduces stress and research time for teachers
  • Moderately saves school money
    I can’t really speak to that as I have only been able to use free resources from ck12
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