Simulations you can argue with.

A diagram tells you what happened. A simulation lets you ask what would happen if the slit were narrower, the incline steeper, the acid stronger — and answers immediately. That gap is the whole reason this site exists.

There are 37 of them here, covering 55 chapters of physics and chemistry. Each one runs entirely in your browser: no plugin, no install, no account, no cost. Open one on a projector, put it on a worksheet, or send a student a link.

How they are built

Each simulation is a single self-contained page that computes the real physics or chemistry rather than animating a canned result. Where we simplify — and every model simplifies — we would rather say so on the page than let a student carry a wrong idea away from it.

Using them

Every simulation has an embed link, so you can put it directly into your own lesson page. We ask only that the attribution line stays visible.

Who makes this

Zitmus is made by the team behind BuzzBrain, where the same simulations sit alongside practice and feedback for students preparing for school and entrance exams. This site is the part that should be free to everyone.