Khan Academy
Khan Academy (nonprofit)
World-class fundamentals, completely free.
Price
Free
Last checked
June 2026
Best for
Free fundamentals
Category
Everything under one roof
About Khan Academy
Khan Academy is the rare platform with no catch: a nonprofit offering thousands of lessons in math, science, economics, and computing, completely free with no premium tier hiding the good stuff. The mastery-based exercises adapt to your level, and the AI tutor Khanmigo helps when you get stuck. It will not give you a career certificate; it will give you the foundations everything else builds on. For brushing up fundamentals, nothing beats it at any price.
“Completely free, no catch, no upsell: a nonprofit that teaches math, science, and economics better than most paid platforms. The gold standard for foundational knowledge.”Editorial team, via CourseShortlist
Where to get it
Free
Sign up directly with the provider.
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