Khan Academy
Verified working Aug 3, 2026
Free interactive lessons and practice for school subjects and test prep.
Khan Academy is a nonprofit learning platform with instructional videos, articles, and practice exercises across math, science, computing, economics, humanities, and test preparation. Learners can work through courses at their own pace, while teachers and parents can assign material and monitor progress.
Why it stands out
- Entire core learning experience is free rather than locked behind a paid subscription.
- Strong coverage of K-12 math, with many topics broken into small practiceable skills.
- Combines instruction, practice, and progress tracking in one place instead of only hosting videos.
- Teacher tools make it usable for classrooms and tutoring, not just solo study.
Good to know
- The site requires JavaScript to load properly, so restrictive browser settings or some extensions can block access.
- It is strongest for foundational academic subjects and test prep, not advanced professional training or accredited credentials.
- Progress tracking and assignments are most useful when learners sign in with an account.
Under the radar: If you already know part of a course, start with a unit test or course challenge to uncover gaps instead of watching every lesson in order.
Photos
Students, parents, and teachers who need free, structured practice in core school subjects. Review a confusing math topic with short lessons and immediate practice. Prepare for standardized tests using targeted exercises and progress tracking. Assign supplemental practice to a class or homeschool learner. Fill knowledge gaps before starting a more advanced course.
Self-paced courses, video explanations, interactive exercises, quizzes and unit tests, mastery tracking, teacher/classroom tools, parent accounts, and test-prep resources for exams such as the SAT.
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- CK-12 — ck12.org
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