Three things that make this different
We didn't set out to build another video player. We built the thing we wished existed when we were learning this stuff.
Widgets you can touch
Every concept ships with an interactive widget. Drag a slider, watch a graph redraw, see the answer light up. No videos. No skimming.
Code, in the lesson
Python and JavaScript run in your browser. Edit a line, hit run, see the output. No context switch, no setup.
Mastery, not streaks of luck
Skills move up and down based on what you actually know. Spaced repetition surfaces what you're about to forget — exactly when you need to revisit it.