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Antibody-Antigen Binding Kinetics

Interactive antibody-antigen binding simulator: watch individual antigen molecules flip between free and bound states under real law-of-mass-action kinetics, tune association/dissociation rate constants and antibody concentration to see how binding affinity (Kd) drives neutralization.

Medicine & Biophysics2DEasy60 FPS📱 Mobile-adapted⇄ 3D version

Antibody neutralization isn't instant or all-or-nothing — it is a reversible chemical reaction governed by the law of mass action. This simulator tracks a population of antigen molecules, each independently binding and unbinding an antibody pool according to the association rate constant kon and dissociation rate constant koff. Together those set the dissociation constant Kd = koff/kon, the standard measure of antibody affinity. Tune kon, koff and antibody concentration to see how affinity and dosing combine to determine what fraction of antigen ends up neutralized at equilibrium, and how quickly the system gets there.

⚙ Under the hood

Simulate the mean-field kinetics of antibody-antigen binding and unbinding at a population level using real association and dissociation rate constants.

ImmunologyBinding KineticsPopulation Dynamics

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install