Khan Academy

Khan Academy

iOS Universal Education

Free
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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, or NCLEX-RN. 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 khanacademy.org, 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, humanities (art history, civics, finance), and more!

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

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What's New

This update includes a lot of improvements, just for you!
- We've completely redesigned the main screen of the app, to highlight your assignments and to give you quick access to the courses you've selected on our website.
- Bookmarks and downloads have a fresh design, and now you can download HD versions of videos!
- We've got a brand-new video player for phones and tablets.
- Under the hood, we've rebuilt much of our infrastructure—which is a fancy way of saying that the app now takes up much less space on your device.
- We've added support for Indonesia, and more languages are coming soon.
Take a look around, and let us know what you think by leaving a review!

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