Freeform Feynman diagram sandbox, parameter tuning, and physics challenges
You've learned the fundamentals — now explore freely! Build any Feynman diagram you can imagine, tune the parameters of the Standard Model to see what happens, test your knowledge with challenges, and explore the full Standard Model overview.
A full-featured Feynman diagram sandbox. Place vertices, connect them with propagators of any type, and build complex interaction diagrams from scratch.
What would the universe look like if the electron were heavier? If the strong force were weaker? Tune the fundamental parameters and see whether atoms, nuclei, and chemistry can still exist.
Test your particle physics knowledge with a series of challenges covering particles, forces, conservation laws, and Feynman diagrams.
See all 17 fundamental particles and their interactions in a single beautiful overview. Click any particle to highlight which forces it participates in.
Select any particle and see its decay modes, branching ratios, and lifetime. Watch a population of particles decay in real time following the exponential law.
You've explored the full Standard Model of particle physics — from the particle zoo to Feynman diagrams, from QCD confinement to the Higgs mechanism, from collider physics to conservation laws. The Standard Model is humanity's most precise description of nature at the fundamental level. Keep exploring!