SkidpadDeterministic, sim-grade vehicle physics for the web.

Slip-based tires, an implicit drivetrain, and bit-exact results on every browser. Built in public, from the literature.

Sim-grade tires

Feel model for tuning by intuition, Magic Formula 5.2 subset with .tir import, combined slip, load sensitivity, relaxation length, aligning torque.

Rust core compiled to WebAssembly with a vendored software math module. Same inputs, same bits, in Chrome, Firefox, Safari, and Node.

ISO-style manoeuvres run in CI against golden results, and the understeer gradient is checked against linear theory.

Every value that influences the simulation is a telemetry channel, exportable as CSV and JSON with iRacing-style names.