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. Keep learning when you're offline: Bookmark and download your favorite content to watch videos without an internet connection. Follow along with what you're learning in school, or practice at your own pace. Sharpen your skills: Practice exercises, quizzes, and tests with instant feedback and step-by-step hints. Study math, science, economics, finance, grammar, history, government, politics, and much, much more. Learn anything, for free: Thousands of interactive exercises, videos, and articles at your fingertips. 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. Or, if you're feeling particularly adventurous, learn how fire-stick farming changes the landscape of Australia. Get a head start on next semester's geometry. But, if you've been looking for a college-level education for free, Khan Academy is likely to exceed your expectations and more with the app's excellent visual content and frequent quizzes to test your knowledge.Spend an afternoon brushing up on statistics. Learning with Khan Academy is self-directed and doesn't offer the chance to gain a certificate like some other apps on our list.

Life skills: Thoroughly explores personal finance and career options.Computing: Offers an excellent base for learning about computer science.Art and humanities: Covers world history and the art of different empires.Economics: Examines microeconomics, macroeconomics, and financial markets.Science: Goes in-depth on practically every area of biology, chemistry, and physics.Math: Ranges from kindergarten level to college-level calculus.The library of courses is highly comprehensive and includes: Whether you're looking to brush up on your math skills, learn personal finance skills they never taught you in school, or prep for an upcoming AP Chemistry exam, Khan Academy has it all. Khan Academy is a non-profit that aims to 'provide a free, world-class education for anyone, anywhere,' and it certainly delivers on that promise.

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