Tools  /  Pandemic Spread Simulator   Free

Watch it spread — week by week.

A new pathogen doesn't respect borders; it rides highways and airports outward from wherever it starts. Seed an outbreak, set how contagious and how deadly it is, and press play to watch the wave sweep the country county by county — and the toll climb behind it.

Controls
R₀ is how many people each case infects with no immunity. Flu ~1.3, COVID ~3, measles ~15.
Days from infection to first symptoms. A shorter incubation means faster generations — the outbreak peaks sooner locally and the wave sweeps the country faster.
Click a city to seed the outbreak →
newly reached
active outbreak
past the peak / immune
major metro hub
Week 0
Results
Cumulative infected
0
Cumulative deaths
0

The first two weeks decide the next two years. Be ready to go quiet early.

Deep pantry, meds, N95s and the ability to isolate for weeks — pandemic prep is mostly food, distance and discipline.