Physics,taught visually.

Physics.explained began as a rejection of static textbook diagrams. Most physics content on the web is written once, rendered flat, and frozen — a pendulum drawn but not swung, an orbit shown but not integrated. Students are left memorising shapes instead of developing intuition.

The product treats every diagram as executable physics. Motion is computed at runtime by ODE integrators with numerical tolerances chosen to stay faithful under perturbation. Equilibria are solved by Newton–Raphson root finders. Drag initial conditions, nudge parameters, and the simulation responds as the equations themselves would.

Around the solver core sits a dense reference layer: a cross-linked concept graph spanning classical mechanics, electromagnetism, thermodynamics, relativity, quantum mechanics, and modern physics, plus biographical profiles of the physicists behind every result. Every concept links back to the simulations that demonstrate it and the people who shaped it.

On top of all of that sits /ask — an AI tutor grounded in the same concept graph. Ask anything from "derive Kepler's third law" to "why does entropy always increase?" and get a worked answer with citations back into the library. The full encyclopedia, the solver engine, and the tutor are free and open source.