Khan Academy

Khan Academy

About this app

You can learn anything. For free.

Spend an afternoon brushing up on statistics. Discover how the Krebs cycle works. Get a head start on next semester's geometry. Prepare for upcoming 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 personalized 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: Tailored to your current learning level, our mastery system gives instant feedback and recommendations on exactly which skills and videos to try next. And, if you choose to create a free account, your learning syncs with http://khanacademy.org, so your progress is always up-to-date across all your devices.

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

Already familiar with the Khan Academy website? Not all functionality is available in this app. Community discussions, computer programming content, test prep, parent tools, teacher tools, and district tools should all be accessed directly at http://khanacademy.org.

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

Ratings and reviews

Totally helpful. I used it on my pc, but right now, I just installed it on my android phone. I can't tell if it's just my phone's OS lagging with the app, but the feedback is delayed whenever I click on things (settings button, for example). I just wanted to raise my concern just in case the problem was on your side. More power to the team!

I recommend this to people who's struggling with math and science. Although some courses are missing. Not sure if it's just me but some courses available in the desktop website (e.g. Computer Animation, Programming etc...) is nowhere to be found in this mobile app. Please add ALL of your available courses in the app and update the app regularly. Also please add practice tests and quizzes in your Science course, make it very similar to your Math course. The math course is perfect so far!

it's a phenomenal app! I use it as an adult woman who thought I hated math but turns outI lacked practice and consistency. this app gives you both! the layout of each subject unit is great. it reminds you to come back and use the app with an notification in your email i like that feature a lot. it's free. I don't know how it's free. but I'm very thankful it is.

What’s new

∙ Bug fixes and performance improvements.