Name: Khan Academy
Author: Khan Academy

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Khan Academy: free lessons, practice and offline video

By Irfan Rosli

News editor

Mastery-based practice that suggests the next skill or video
Step-by-step hints and instant feedback on exercises
Videos, articles and exercises across math, science and humanities
Downloadable videos you can watch without an internet connection
Optional free account that syncs progress across devices
Teacher, parent and test prep tools are on the website instead

A free library of lessons for students and self-learners

Khan Academy is a free learning app built around a library of expert-created videos, interactive exercises and written articles. The listing aims it at students, teachers, homeschoolers and adults who want to study a topic on their own, from a quick review to a full course.

Content is organized by subject, so a learner can start from a topic they already know and work outward. The library is described as personalized, meaning the app adjusts what it shows to the learner's current level.

Practice exercises with hints and a mastery system

Practice exercises, quizzes and tests give instant feedback as you answer. When a learner gets stuck, step-by-step hints are available within the exercise.

The mastery system tracks where a learner stands on each skill and recommends which skills and videos to work on next. The listing says this is based on the learner's current level, so the suggestions change as they progress.

Subjects covered by the video and article library

Math coverage runs from arithmetic and pre-algebra through algebra, geometry, trigonometry, statistics, calculus, differential equations and linear algebra. Science includes biology, chemistry and physics, and economics includes microeconomics, macroeconomics, finance and capital markets.

The humanities section lists art history, civics, US history, US government and politics, and world history. The listing also includes computer science principles, though computer programming content is directed to the website.

Downloading lessons for offline viewing

Videos can be bookmarked and downloaded in advance, so they can be watched without an internet connection. This suits commuting, travel or places with unreliable connectivity, as the listing presents it.

Bookmarks let a learner save favorite content to return to later, both online and offline.

Syncing progress with a free account, and what stays on the website

Creating a free account is optional. With an account, learning progress syncs with khanacademy.org and carries across all of the learner's devices.

Community discussions, computer programming, test prep, parent tools, teacher tools and district tools are not in the app. The listing directs users to the website for these features.