Stop guessing your racing line.
Prove it with real vehicle physics.
Fastest Racer runs a full quasi-steady-state lap simulation — real load transfer, tire load-sensitivity, and a friction-ellipse-coupled GG-diagram — to compute the mathematically optimal line for your car on your track. No black box. Every number is traceable to a physical model, not a black-box AI guess.
No signup required for the demo track. Runs entirely in your browser.
Built like an engineering tool, not a game
1. Full vehicle model
Mass, aero (downforce + drag), tire load sensitivity, drivetrain, brake limits — every parameter is a real physical quantity you can see and change, not a difficulty slider.
2. GG-diagram from first principles
Lateral, traction, and braking limits are derived per-speed from load transfer and a Pacejka-style tire model — the same approach real race engineers use.
3. Optimal line, not a heuristic one
A numerical optimizer searches the full space of racing lines for the one that minimizes lap time under your car's actual grip envelope.
Pricing
Start free. Upgrade when you want the real thing.
Free
- ✔ 1 demo track & car
- ✔ Full physics engine, unrestricted
- ✔ Racing-line optimizer
- ✘ Real-world circuits
- ✘ Validated F1-spec car model
Pro
- ✔ Everything in Free
- ✔ Real-world circuits (Spa-Francorchamps & growing)
- ✔ Validated F1 2024-spec car model
- ✔ New circuits added monthly
- ✔ Priority track requests
FAQ
Why not just use my sim's built-in telemetry?
Sim telemetry shows you what you did. Fastest Racer shows you the mathematical optimum for your exact car — the target to chase, derived from physics, not from a lap someone else drove.
Is my data private?
The simulation itself runs entirely in your browser — your track and car setups never touch our servers unless you explicitly save them to your account.
Can I cancel anytime?
Yes — Pro is a monthly subscription with no lock-in, managed through Stripe's billing portal from inside the app.