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Khan Academy
Completely free, nonprofit education for K-12 and beyond
Khan Academy remains the gold standard for free education — a nonprofit with no ads, no paywalls, covering K-12 math and science in real depth.
Overall score
8.8
out of 10
Price
Free (nonprofit, always free)
Courses
10,000+ videos and exercises across math, science, and more
Languages
Available in 50+ languages
Course Catalog82%
Khan Academy's strength is K-12 math and science, covering everything from early arithmetic to AP-level calculus and physics, entirely free.
Teaching Quality88%
Sal Khan's approachable teaching style and mastery-based exercises make difficult concepts click, especially in math.
Platform UX89%
The dashboard clearly shows mastery progress by topic, which is motivating for both students and parents monitoring progress.
Pros
✓100% free, always — funded as a nonprofit
✓No ads, no upsells, no paywalled content
✓Mastery-based practice with detailed progress tracking
✓Strong for K-12 math, science, and test prep (SAT)
Cons
–Less content for adult professional/career skills
–Video production is simpler than paid platforms
–Programming content is more basic than dedicated coding platforms
What’s included
Mastery-based practice exercises
Personalized learning dashboard
Official SAT practice (with College Board)
Teacher and parent tools
Offline app access
Khanmigo AI tutor (paid add-on)
Pricing
Free, permanently — Khan Academy is a nonprofit and has never charged for its core content.
Certificates
No certificates are offered — Khan Academy is built for genuine learning and mastery tracking, not credentialing.
Mobile App
The mobile app supports offline access, useful for students with limited internet connectivity.
Popular courses on Khan Academy
★ 4.862,000 ratings
Algebra 1
Comprehensive Algebra 1 curriculum with practice exercises.
★ 4.989,000 ratings
SAT Practice (Official, with College Board)
Free, official SAT prep with personalized practice.
★ 4.621,000 ratings
AP Computer Science Principles
Introductory programming and computer science concepts.
★ 4.734,000 ratings
Biology
High school-level biology covering cells, genetics, and ecology.
Frequently asked questions
Yes, it's a nonprofit and has never charged for its core educational content.