See the difference between two laps.
DZ replay is a Windows desktop app operated by Velyra LLC. Import iRacing IBT recordings or compatible CSV telemetry, compare your lap with a reference, and inspect racing lines, braking, throttle, steering and time delta together.
What you can do
- Replay a single lap or compare two compatible laps.
- Align by distance, then let each car advance on its own time axis.
- Inspect speed, braking, throttle, steering and yaw rate together.
- Choose a corner, zoom the charts and step through the replay.
What the invitation beta includes
We are planning two months of Closed Beta testing, open by invitation. Join the waitlist; we review applications and invite testers in batches. Invited users can sign in to the Windows app and keep their assigned access. Member includes 2D replay, annotations and 2D video export. Pro adds advanced analysis, 3D replay, Live comparison, voice notes, braking cues and 3D video export; paid upgrades remain available. All lap analysis runs locally. Keep backups of your recordings and exported .dzreplay analyses.
Understand the limits
DZ replay is an exploratory analysis tool. GPS traces are not surveyed track boundaries, Body Slip Proxy is not tyre slip angle, and timing reconstructed without timestamps is an estimate. It does not provide automatic coaching or claim that one isolated input guarantees a faster lap.
DZ replay is an independent project and is not affiliated with or endorsed by iRacing or Garage61. Those names identify supported telemetry sources.