Code.org

Code.org provides free computer science education to every student, from kindergarten through high school. The platform uses a visual block-based coding environment for younger learners, transitioning to JavaScript and other languages in upper grades. Every lesson is self-paced, with built-in hints and immediate feedback on code correctness.

Teachers use Code.org as their primary computer science curriculum, and parents turn to it for at-home coding introduction. The standards-aligned structure means students progress through well-defined skills at their level, whether they're learning loops in grade 3 or variables in grade 8. The nonprofit model keeps all core content free forever.