Khan Academy vs edX vs Coursera: The Best Free Learning Platforms Compared (2026)

"Free online learning" covers three quite different things, and Khan Academy, edX and Coursera each represent one of them. Knowing which is which saves you from, say, hunting for university lectures on a platform built for high-school algebra — or paying for a certificate when auditing would have done. Here's how they compare when your budget is exactly zero.

Khan Academy: free foundations, no strings

Khan Academy is the purest free option — everything is free, forever, with no certificate paywall because it doesn't really do certificates. Its strength is foundations: math, science, and economics taught in short, clear lessons with endless practice problems. If a subject has gaps in your basics — you want to relearn Algebra before tackling data work, or get Statistics and Probability solid before analytics — this is the best place to fix them, at any age.

What it isn't: a source of career credentials or university-level specialisation. Use it to build the floor other courses assume you already have.

edX: real university courses, free to audit

edX was founded by MIT and Harvard, and it still feels closest to actual higher education. Most courses can be audited free — you get the full lectures and materials — and you only pay if you want a verified certificate. The crown jewels are genuinely world-class: Harvard's CS50 is arguably the best introduction to computer science anywhere, and courses like Michael Sandel's Justice bring a famous lecture hall to your laptop for nothing.