Khan Academy 4+

You can learn anything

Khan Academy

    • Free



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, 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

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 8.1.1

∙ Introducing Experimental Dark Mode! Dark Mode is currently available in select areas of the app. We have future plans to extend it everywhere, but for now, think of it as a moonlit sneak peek. The feature can be turned on and off under Settings.
∙ Bug fixes and performance improvements.

Ratings and Reviews

4.6 out of 5
6.7K Ratings

6.7K 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.

Lorellendi ,

Education at its Best

Khan Academy is without hesitation the top resource for mathematical self-study! It exemplifies what the internet and open-source learning can achieve. Its theory of mastery is essential for real progress in mathematics—that is, every skill builds off of a previous skill. Pushing students up higher and higher before mastery really just causes them to struggle more and more. Kahn allows learners to go back and forth in their study regardless of level until they feel confident in their skills.

Augoo1 ,

The Seven Years War

You lost my vote at the beginning when the narrator said

“The Acadians moved to Louisiana and became Cajuns”

Seriously? Are you British?

They were deported, rounded up like livestock, a lot of them just coming out of church, pushed onto boats, families separated, mothers, children , husbands and wives. A horrible inhumane act of the ruling British. That is how the Cajuns came to be. Come visit the Acadian villages in eastern Canada, some descendants still live there. The Brits missed some intheir haste.

Could you just do more research?

App Privacy

The developer, Khan Academy, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer's privacy policy.

Data Linked to You

The following data may be collected and linked to your identity:

  • Usage Data

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Contact Info
  • Search History
  • Identifiers
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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