SynapseLab

Most "neuron simulators" are cartoons — a shape that lights up when you click it. SynapseLab isn't. It runs the actual Hodgkin-Huxley equations, the real 1952 model of how neurons fire, computed live in your browser. When you inject current below threshold, the membrane stays flat. Cross threshold, and you get a genuine, physically accurate spike — full amplitude, real refractory period, no faking it.

What's inside:

⚡ Live Lab — An oscilloscope-style trace shows the membrane potential in real time, next to live Na⁺/K⁺ ion channel gauges so you can watch depolarization and repolarization actually happen. Adjust stimulus strength and pulse width, fire single or double pulses, and watch the impulse travel down a myelinated axon via saltatory conduction.

📖 Learn — Six focused explainers covering resting potential, threshold, the action potential upstroke/downstroke, the refractory period, saltatory conduction, and synaptic release — written to explain why, not just label a diagram.

✅ Quiz — Seven scored questions with full explanations, built to test real understanding rather than memorized labels.

Why it's different:

Runs on the genuine Hodgkin-Huxley conductance model (not an approximation) — the same equations taught in physiology and neuroscience courses

Single file, works completely offline — no install, no account, no internet required

Built for touch — works cleanly on phones and tablets, not just desktop

No ads, no tracking, no data collection

Who it's for:

Biology, A&P, and neuroscience students studying action potentials — and teachers who want a real, manipulable demo instead of a static diagram on a slide.

Get it:

One HTML file. Download it, open it in any browser, done.