Live slip angle
Drift angle (an estimate), speed and G: the motion sensors read 60 times a second, the GPS once, big enough to see from the corner of your eye. A run starts by itself when you roll.
Ian's qualifying run, 10 to 18 seconds in, rebuilt by YAW from his phone alone, with the speed and angle overlay YAW lays over any video of a run. The car is YAW's stand-in.
For drivers & teams · free · no hardware
Know the fix
before the next lap.
The phone on your dash, turned into drift telemetry: your angle live, a score when you stop, and one line on what to fix next lap. Free, no account, and it works with no signal.
01 — Tried at a real event
That's Ian's qualifying run, read by his phone.
HOTPIT Autofest Round 5 at the Bullring, Las Vegas, 16–17 Oct 2026. Ian ran YAW in his S14 through practice and his one qualifying run, with nobody touching the phone. Three more moments of that run, as YAW read it:
29runs on Friday, recorded by themselves, every one saved and filed the same day
9/11laps where Zone 2 cost him the most: one clear thing to work on
11→4metres, about, from the Zone 2 clip, first lap of the day to his best outing (phone GPS: give or take a few)
70 / 71YAW's read of his qualifying run on the zones the day's laps found (60 on the official layout), and what the judges gave it
Set up YAW for your next practiceFree, on the phone you have. One driver and one weekend is a start, not proof: that's why the next month puts YAW on more phones and more cars.
Seventy on the zones the day's own laps found; the judges gave 71. Here's how it told him the moment he stopped. 02 — After every run
One line. One fix.
Between laps you've got ten seconds, not ten minutes. So when the car stops, YAW leads with this:
- the score70
- where it cost the mostZone 2
- by how muchabout 7 m from the clip
- next lapTighter to the clip.
Said out loud as the run saves, in practice“Run saved. Seventy. Zone two, seven metres from the clip.”
In the zones it stays quiet: one short call after the last zone names the worst. Everything else is one tap down: every zone's line and angle, the map, the 3D replay, your best lap laid over this one.
That's one run. Here's the rest of the day YAW takes care of.
03 — What it does today
From the first lap to the drive home.
All built, all on the phone you already carry: the headline of each, and the rest a tap away.
Measure
The phone on the dash is the sensor. The work is reading it truthfully.
A way to check against video
Film a run from a still camera, tap the car's real angle frame by frame, and see YAW's reading beside it. Tried on test video so far; the first real check is at the next practice.
3 more: The GPS lag taken out · The phone's gyro order, learned · Made for the paddock
The GPS lag taken out
A phone's GPS says where you were a second or two ago. YAW learns that delay for each phone, and how the phone is mounted, and takes both out.
The phone's gyro order, learned
Some phones send their rotation in a different order. YAW works it out from the drive and remembers it for that phone; older runs are re-read in one tap. More phones still need checking.
Made for the paddock
Opens and records with no signal. A run survives the app being closed. A 30-second check tells you it's all working before you roll out.
Coach
After every run, the one thing to fix. Not a wall of numbers.
The one-line read
The score, the zone that cost the most and what to do next lap, first on the screen and said out loud when the run saves.
Judged like the series
Line, angle and style on the course's zones, weighted like HOTPIT or Formula DRIFT, against your own best run at that track.
3 more: Line coaching · Your qualifying run, beside the judges · Replay and compare
Line coaching
Each zone read against the line the field drove. Quiet while you're in the zones, then one call after the last: “Two. Wide.”
Your qualifying run, beside the judges
Tag the run that counted, add the judges' scores, and see YAW's read of it next to theirs.
Replay and compare
Every run rebuilt in 3D with your own car, paint and number, and two laps laid over each other corner by corner.
Run the event
One phone starts an event. Everything after that can run on YAW.
The big screen
Start an event on any phone and open it on a TV. Drivers join by QR code, and every car shows live on the map with boards you can read across the tent.
The judges' tablet
Judges score every run on a tablet. The scores land on the big screen, the results and each driver's phone as they're given.
Battle replays
Every battle in 3D from the laps the event keeps: who led, how close the chase stayed and how much angle it held.
4 more: Courses that find themselves · The bracket · Tandem, two phones · Coach notes and clips
Courses that find themselves
The zones are found from the laps everyone drives, and each track remembers its course for every phone that goes there.
The bracket
Seeded from qualifying, battles called by the judges' votes, and every battle run tagged by itself.
Tandem, two phones
Pick the lead car on the event. The chase phone measures the gap, how close it stayed and how well it matched the angle.
Coach notes and clips
The crew sends a note that's read out after the run. A clip filmed from the stands lands on the driver's run page.
Share
Every run is content. YAW cuts it for you.
YAW Cam
Anyone's camera, with the car's name, speed and angle burned into the video. The crowd taps to hype the car on track.
The day's reel
The day's best moments cut into one 9:16 video on the phone, ready to post.
2 more: Stream overlay and booth · Recap and season
Stream overlay and booth
Live numbers over an event's stream, and a commentator's screen with the storylines of the day.
Recap and season
A picture of your day to post, the month's leaderboard and your own driver page.
04 — For your team
The whole crew on the same page.
Start an event from any phone, and the pit, the stands and the driver all see the same day.
01
The crew sees every car
The event's live map on any phone or laptop in the pit.
02
Coach notes
Sent from the event's organizer screen, read out to the driver when the run ends.
03
Clips from the stands
Filmed on YAW Cam at the event and sent to the driver's run page.
04
Tandem practice
Two phones, two cars: the gap and how close the chase stayed, every pass.
05
Content for sponsors
The reel, the recap picture and YAW Cam video, with the driver's handle on every one.
05 — The next month
What's coming this month.
What we're shipping and testing over the next four weeks, soonest first.
- by 18 OctLive
The weekend's fixes, on every phone
Out to everyone on 18 Oct (v129): the gyro fix, the sharing fix, the one-line read, and runs put on the course's route. v130 re-reads a phone's older runs in one tap.
- by 31 OctBuilt, shipping
YAW's own address
A real domain before strangers install. Moving is built: runs and set-up come across in one tap.
- by 1 NovTo do
The iPhone app on TestFlight
Ian and the test drivers get the App Store build first. The app is set up in the code (v124); Xcode, Apple's developer account and signing on the Mac are next.
- by 8 NovTo build
“How did that feel?” and lap 1 against lap 2
One tap before the number, so you read your own feel first. Then why the second lap dropped: on Friday it dropped about 14 points an outing, part of that the GPS (being checked).
- by 8 NovTo do
More phones, checked against video
YAW tried on more iPhones and Androids, and a phone on a tripod at the next practice for the first real angle-against-video figure.
- by 15 NovTo do
The first open drift day on YAW
An open practice day with 8 or more drivers, most of them new to us. YAW runs the big screen and the results sheet, and counts who goes out again. The date is the next day Ian enters.
Written 18 Oct 2026 for the month to 18 Nov. Dates are targets; safety and the angle come first, so nothing ships on a day Ian is at the track.
The first open day is next, and you can be on it.06 — Your next practice
Set it up now. Drive with it next time.
Put it on your phone
Scan the code. iPhone: Safari → Share → Add to Home Screen. Android: Chrome → Install app.
Run it at your next practice
Mount the phone solid, run Check, then Start session. Auto-record does the rest.
Tell us your fix
After your first outing, tell us what YAW said to fix, in your own words. That's how we know the read works.
Come to the open day
The first open drift day on YAW is in the next few weeks. Tell us you're in and we'll send the date.
Set up YAW for your next practice
Scan to startyaw-e3r.pages.dev/welcome/iPhone: Safari → Share → Add to Home Screen.
Android: Chrome → Install app.
Android: Chrome → Install app.
- No account. Your runs, courses and videos live on your phone.
- No trackers. No ads, no analytics, nothing about you sold or shared.
- Free for good. Recording, your runs, getting them out, your place on an event's board.
The privacy page · YAW measures what you do; it doesn't make it safe. Drift at events and on closed courses, within your limits and the organiser's rules, and never touch the phone while the car is moving.