Brilliant vs Khan Academy: which free/cheap STEM platform wins? (2026)
Two fundamentally different approaches to STEM education. Khan Academy is free, video-based, and covers everything from kindergarten math to college-level calculus. Brilliant costs $162/year, uses interactive puzzles instead of videos, and focuses exclusively on math, science, and computer science. We used both for a month to learn the same concepts — linear algebra and probability — then tested ourselves. Here's what each platform is actually good for.
Choose Khan Academy if: You're a complete beginner, you want free education with no limits, you learn well from video lectures, you need to cover a broad range of subjects (not just STEM), or you're a student supplementing school curriculum. Khan Academy is one of the best things on the internet — genuinely free, comprehensive, and effective.
Choose Brilliant if: You already understand basic concepts and want to deepen intuition through problem-solving, you prefer interactive puzzles over passive video watching, you're specifically studying math/CS/science, and you can commit to daily practice (15+ minutes). Brilliant makes hard concepts click in a way videos cannot.
The honest answer: They complement each other perfectly. Use Khan Academy to learn a concept (free), then use Brilliant to build deep intuition through interactive problem-solving ($162/yr). If money is any concern at all, Khan Academy alone is genuinely sufficient for most STEM learning.
The comparison
| Feature | Khan Academy | Brilliant |
|---|---|---|
| Price | 100% free (non-profit) | $28/mo or $162/yr ($13.50/mo) |
| Teaching method | Video lectures + practice exercises | Interactive puzzles + visual problem-solving |
| Subjects | Math, science, computing, humanities, test prep, economics, arts | Math, science, computer science only |
| Depth | K-12 through early college | Beginner through advanced (70+ courses) |
| Certificates | None | None |
| Best for | Learning concepts from scratch, test prep, broad subject coverage | Building deep intuition, daily practice, problem-solving skills |
| Mobile app | Yes (full features) | Yes (offline mode on Premium) |
| Our retention test | 71% (linear algebra concepts) | 83% (same concepts) |
Our retention test results tell the story: Brilliant's interactive approach produced 12 percentage points higher recall on the same linear algebra concepts. When you solve a problem by manipulating variables visually and seeing the geometric interpretation update in real-time, the concept sticks differently than watching someone explain it on a whiteboard. But Khan Academy taught the concepts from scratch — Brilliant assumed we already understood the basics and dove straight into deeper problem-solving. They're solving different problems.
Khan Academy: the case for free
Sal Khan started recording math tutorials for his cousin in 2004. Today, Khan Academy serves 150+ million learners with completely free education across dozens of subjects. No ads. No premium tier. No paywall. It's funded by philanthropy (Bill & Melinda Gates Foundation, Google.org, and individual donations). This matters because Khan Academy's incentive is education, not conversion metrics.
The video-plus-practice model works: watch Sal explain a concept in a 5–10 minute video, then complete practice exercises that adapt to your skill level. The mastery-based progression (you must demonstrate proficiency before advancing) prevents the "I watched the video so I know it" illusion that plagues passive learning platforms. For K-12 students, test prep (SAT, LSAT), and foundational college math/science, Khan Academy is the best free resource available. Period.
Brilliant: the case for paying
Brilliant takes a completely different approach: no video lectures at all. Every lesson is an interactive puzzle where you manipulate visual elements, make predictions, and receive immediate feedback. Learning computational thinking through Brilliant feels like solving a game — which is precisely the point. The gamification (streaks, points, daily challenges) drives consistent practice in a way that Khan Academy's more traditional format doesn't.
At $162/year ($13.50/month), the price-per-concept is reasonable if you use it consistently. The free tier gives you 2 lessons per day and access to daily challenges — enough to evaluate whether the interactive approach works for your learning style. The 7-day Premium trial unlocks everything temporarily. Our recommendation: try the free tier for a week. If you're opening the app daily and finding the puzzles genuinely engaging, the Premium subscription is worth it. If you forget about it after day 3, save your money.
Brilliant's limitation is scope. It covers math, science, and computer science — nothing else. No humanities, no test prep, no career-focused skills. For learning Python or AI/ML, dedicated courses on Coursera or Udemy deliver more depth. For general STEM intuition-building alongside other coursework, Brilliant is excellent. Applying science learning to practical domains like evidence-based health analysis is covered on Health Britannica.
The optimal combination
Use Khan Academy (free) to learn any concept from scratch. Use Brilliant ($162/yr) to build deep problem-solving intuition through interactive practice. Use Coursera or Udemy when you need career-relevant certificates or practical project-based skills. This combination costs $162/year total and covers foundational STEM education as thoroughly as any university course. For the complete free learning landscape, see our best free online courses guide.
Get our STEM learning roadmap + weekly course picks
Join 4,200+ learners. No spam. Unsubscribe anytime.
Frequently asked
Is Brilliant worth $162/year when Khan Academy is free?
It depends on your learning style. If interactive problem-solving engages you more than video lectures, Brilliant's approach produces measurably better retention (83% vs 71% in our test). If you're a visual/auditory learner who benefits from video explanation, Khan Academy delivers comparable education for free. The free tier on Brilliant (2 lessons/day) lets you test which approach works for you before paying.
Can adults use Khan Academy, or is it just for kids?
Khan Academy is for everyone. The K-12 content is obviously student-focused, but the college-level math (linear algebra, multivariable calculus, differential equations), statistics, computer science, and economics courses are rigorous adult education. Many college students use Khan Academy to supplement university courses. The interface is clean and doesn't feel childish for adult learners.
Does Brilliant teach coding/programming?
Brilliant offers courses on computer science fundamentals, Python basics, and algorithms — but these are interactive concept courses, not practical programming courses. For learning to actually code in Python, dedicated platforms (Coursera, Udemy, Codecademy, freeCodeCamp) are significantly better. Brilliant teaches you to think computationally; dedicated coding courses teach you to write production code.