Hi, I'm Alp. I've been building LibreCorsa on my own since October, as a side project.

Sim racing usually starts with a 50–100 GB install and a Windows gaming PC. I wanted to see how close a browser tab could get to a proper sim, where you click a link and you're on the grid in a few seconds.

What's in it right now:

• 500 Hz fixed-step physics (4 × 2 kHz substeps), Pacejka combined-slip tyres with 3-band tread temperatures and wear, suspension solved from wishbone hardpoints

• The GT3 is checked in CI against MoTeC telemetry from a real GT3 Evo

• 2026-rules open-wheelers (active aero, 350 kW MGU-K override), GT3s, the MTRacing 496R prototype and a Suzuki Liana road car

• 16 circuits, including RISE Motordrome, which I built from scratch on real elevation data for the circuit planned in Bugesera, Rwanda

• Rain that builds a water film and dries along the racing line

• AI races, ghost laps, a weekly time-trial challenge, private WebRTC rooms and an open online race every 20 minutes

• Keyboard, gamepad, touch or steering wheel (browser WebHID force feedback is experimental, and there's a Windows DirectInput bridge)

Code is MIT on GitHub. Some community 3D assets have non-commercial licences, so there are no ads, accounts, microtransactions or paywalls.

Try a lap at https://librecorsa.org and tell me what you drove with and what felt good or rough.

(Independent fan project, not affiliated with Formula 1, the FIA, or any team or circuit.)