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 7.0.2

∙ Introducing support for multitasking on iPad!
∙ Improved navigation on tablets.
∙ Redesigned Search tab includes recent searches and a "Surprise me!" option.
∙ Bug fixes and performance improvements.

Ratings and Reviews

4.3 out of 5
568 Ratings

568 Ratings

Editors' Notes

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.

Seshgeetar ,

Absolutely amazing information

I love the way you present all of this information. I’m re learning it all 20x better than I ever did at school thanks to the way that you teach it. The diagrams and colours make it very easy to visualise what I’ve learned when thinking about it all a few hours later to solidify the information in my mind.
Also the quiz section at the end of each section are very thorough and well put together. Currently the only thing I would update is that when moving rays and lines around on some of the quiz sections (not all just some) the whole page moves as well as the line...this can get a bit frustrating...but absolutely love this and can’t wait to brush up on more of these fundamentals...I reckon once I have I’ll be delving into some of your more advanced topics, thanks so much! Ps your voice sounds like John Mayer at least 70% of the time you talk...and I mean identical, my g/f was next to me while studying and said...John Mayer can’t know all of this about Physics and Maths as well!?

Developer Response ,

Hi there!

Thank you so much for the great review :)

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!

jatten1 ,

Most underrated service out there!

I discovered Khan academy during my university studies and came to realise this site is completely free but AMAZING. It’s not a half arsed quickly put together app or website it’s a fully fledged lesson / course provider for FREE. I highly recommend using this app / website if you want to learn anything before paying for a service. What these guys and gals are doing at Khan academy is amazing! Always believed education should be free?? KHAN academy is your answer. And no I’m not sponsored/ work for them or anything I just really like the service. I started the maths one after finding during my science uni studies my maths was lacking dramatically thanks to Khan it made my course a whole lot more bearable. 100% download. I never leave reviews but this needed one!


Khan Academy
63 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad and iPod touch.


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

Age Rating


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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