You can learn anything. For free.

Spend an afternoon brushing up on statistics. Discover how the Krebs cycle works. Learn about the fundamentals of music notation. Get a head start on next semester's geometry fundamentals. Prepare for the SAT, GMAT, LSAT, MCAT, NCLEX-RN, and AP exams. Or, if you're feeling particularly adventurous, learn how fire-stick farming changes the landscape of Australia.

Whether you're a student, teacher, homeschooler, principal, adult returning to the classroom after 20 years, or a friendly alien trying to get a leg up in earthly biology — Khan Academy's learning library is available to you, for free.
- Learn anything, for free: Thousands of interactive exercises, videos, and articles at your fingertips. Study math, science, economics, finance, grammar, history, government, politics, and much, much more.
- Sharpen your skills: Practice exercises, quizzes, and tests with instant feedback and step-by-step hints. Follow along with what you're learning in school, or practice at your own pace.
- Keep learning when you're offline: Bookmark and download your favorite content to watch videos without an internet connection.
- Pick up where you left off: Your learning syncs with, so your progress is always up-to-date.

Learn using videos, interactive exercises, and in-depth articles in math (arithmetic, pre-algebra, algebra, geometry, trigonometry, statistics, calculus, linear algebra), science (biology, chemistry, physics), economics (microeconomics, macroeconomics), humanities (art history, civics, finance, US history, US government and politics, world history), and more (including computer science principles)!

Khan Academy is a 501(c)(3) nonprofit organization, with the mission of providing a free, world-class education for anyone, anywhere.

What’s New

Version 6.7.1

- New Feature: "Mastery Challenges" available in Course Mastery - strengthen skills you’ve already practiced by unlocking 6-question challenges.

- Introducing support for Czech!

- Bug fixes and performance improvements.

Ratings and Reviews

4.0 out of 5
4.9K Ratings

4.9K Ratings

Editors’ Choice

Khan Academy is an education app for everyone—whether you’re a parent helping your first grader with geometry or a postgrad looking for a deep dive into microfinance. If there’s a topic you want to learn about—no matter how basic or advanced—chances are Khan Academy has a video lesson for it.

liliacs ideas ,

Needs improvement

I think there’s so much stuff and challenges and quizzes and videos to help, but it gets really confusing sometimes when there’s so much information thrown at you. In the assignments tab I think you should add important key features, viewing the assignments from due earlier to due later, viewing assignments from highest level like 88% on a practice to 100% on a practice and separating them from videos and practices and everything else. It’s really a pain to scroll all the way to the bottom to see my assignments I didn’t complete since my teachers assign a LOT and I mean A LOT of homework on your app. I decided to rate your app fairly and not biased on we’re I like math or not, but rather the methods to teach and learn math. So there are some highlights. I like that you get hints for every single practice and it must be hard to make all of the detailed word problems. I also like that you can look back into the questions you messed up and learn from those questions.

Developer Response ,

Hi, there!

Please know that we continue to add new content to offer a better content library on Khan Academy. I encourage you to share your request in our discussion forums (, where users can add their thoughts to yours and vote on your suggestions.

Thank you!

Smitticus 27 ,

Incredible Content; Mediocre Connectivity

Khan Academy has a spectacular library of instruction videos. I used them last year to study for the MCAT and found that there are no other resources that are even close in quality of content. It’s also extremely convenient to have downloaded videos and text documents on the app so I can study in small bits here and there, e.g. while waiting in line at the barber shop. Khan made a huge difference to my ability to study.

Last year I had some issues with downloads and the control I had over WiFi vs. cellular data and streaming vs. downloading the content. I took a break for about 8-9 months and am trying the app again—now I’m having the same issues but much worse! The menus take forever to load and frequently crash the app. Practice quizzes and text documents don’t download (even though they say they do) and require streaming—the only content that download is videos. Download speeds are super slow compared to the speeds I get on other apps—regardless of whether I’m on WiFi or cellular. It isn’t my connection—I’ve tried Google’s internet speed test and also successfully downloaded other content such as Netflix movies through my same WiFi access points and cellular network at my house. PLEASE fix these problems, Khan Academy—your content is too good to be without!!

Developer Response ,

Hi there!

Thanks for taking ou the time to review the Khan Academy app :)

Please try uninstalling/reinstalling the app. If the issue persists, we would be more than happy to investigate further, please send us a ticket over at our support hub!

Here's the URL:

Thank you for your interest in helping to improve Khan Academy!


Khan Academy
68 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Armenian, Bengali, Bulgarian, Czech, French, Georgian, German, Indonesian, Korean, Norwegian Bokmål, Polish, Portuguese, Serbian, Simplified Chinese, Spanish, Turkish

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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