With the free CK-12 FlexBook® app for smartphones, you have the power to read the entire collection of CK-12 FlexBook® textbooks on your phone. All CK-12 FlexBook® textbooks are aligned to content standards.
You can also download the textbooks on your phone to read offline, for those times when you don’t have Wi-Fi or cellular connection, making CK-12 content available anytime, anywhere, even without connectivity. You can download as many FlexBook® textbooks as you want, limited only by the storage space on your phone. Want to make room for new FlexBooks®? You can always delete the downloaded FlexBooks® you have finished reading to make room for new ones.
You can also personalize the app by adjusting the font type, font size, line spacing, and background color to suit your reading needs.
CK-12 FlexBook® textbooks are available for the following subjects at the middle school (grades 6-8) and high school (grades 9-12) levels:
Algebra (including Algebra I and Algebra II)
SAT Exam Prep
See all of our learning resources at http://www.ck12.org. Also, see our companion app for CK-12 Math and Science on the app store.
Don’t forget to check us out on social media!
CK-12 is a non-profit that creates and curates high-quality STEM content for students and teachers around the world. The organization was founded with the mission to enable everyone to learn in their own way—for free.
- Modified registration experience.
- Minor bug fixes and improvements
Ratings and Reviews
Some app issues, wonderful content...
I enjoy reading these books and often understand them better than the textbooks my professors assigned. I had some issues downloading the books for offline reading. I had to quit the app and try again. It showed no progress but then one book finished. The second book showed no progress when viewing my library, but when clicking on the book and viewing the chapters they did show progress. When reading, I couldn’t highlight test or make any notes. (I’d really love if you added that feature as it helps me to focus better when reading and learning material.) When I clicked on underlined words, a window came up, but with no content. For example, clicking “ion” in CK-12 Chemistry Concepts (Intermediate), Section 7.3, brought up a blank window every time I tried. (I have a full WiFi signal, so that isn’t the issue.) Overall, I’m glad there’s an app, I just hope these things are fixed and that the features I mentioned would be added. Then I’d happily give the app five stars. Please consider this constructive feedback. I don’t want to discourage you. I want to encourage you. I am confident this can be made better. Thank you!
I mean the name says it all and it teaches a curriculum that school all teach but you can do it with your hands. Kids can be around your phone or ipad all day, why dont you give them this app!? It’s making kids use precious time wisely!
Epic for learning any subjects without buying expensive textbooks. Just get them here for free!
With Family Sharing set up, up to six family members can use this app.