These are teaching tools for exploring statistical and mathematical concepts in ways that are hard to show in a textbook and almost impossible to draw on a chalkboard. You control the inputs and see the results change in real time.

Each app walks through a concept across a sequence of tabs that start with guided examples and build toward more complexity. Most apps include a Blueprint panel with the underlying theory and math. Most also end with The Anvil, a sandbox for open-ended experimentation.

These work best when you come in with some context from a lecture or reading. Use the guided tabs to build intuition, check the Blueprint when you want to see what's happening under the hood, then go to The Anvil and try to break things.