Get the beta.

AsyncRacing is a free beta on iPhone, through TestFlight. There’s nothing to buy, and the runs you record are yours. Here’s what it does today, and what to know before you install.

What you need

• An iPhone on iOS 17 or later. iPhone only for now: no iPad layout, no Android.
• A rigid phone mount. The phone’s motion sensors read the car through the mount. A phone sliding around on a seat reads noise.
• Somewhere you’re allowed to run. A drag strip, or private land you have permission to use. Runs on public roads are never scored or ranked.

What it does today

• Records a pass from a stop (60 ft, 0–60, the eighth and the quarter, with trap speed) or a rolling 60–130.
• Corrects every run to one standard day with same-air correction, so the weather doesn’t decide who wins.
• Puts real people’s recorded runs in front of you on Tonight, with the light you need to beat each one. Also live heats, a daily race and ranked boards by class.
• Lets you pick your car from 50 models, and shares any race as a link anyone with the app can race.
• Works out every saved run again on our server from what your phone recorded. The app never gets to state its own numbers.

Know this first

It’s a beta, and phones differ. Capture keeps getting better (this month we found and fixed a bug that read some launches and rolls slower than they were), but every phone and mount is a little different. If a number looks wrong, tap Share diagnostic on the result screen and send it. It carries the raw recording, and it’s how those fixes were found.

What we collect

Short version: location and motion only while a capture is armed, never in the background; public-road runs are never scored, ranked or shown, and leave the phone only as an anonymous recording if you turn on Share my runs; closed-course runs you save are submitted so the server can re-derive and rank them. No ads, no third-party tracking, no data sale. The privacy policy spells out every field.

Want to understand it first?

The same-air correction page walks through how the weather comes out: the formulas, and the published standards they’re checked against.