Lap timer & pace notes for iPhone
Clutch writes your pace notes for you. Record the road you drive, or import a route — Clutch works out every corner from the geometry, including which way it goes and how tight it is, then speaks them to you ahead of time while it times your laps from actual gate crossings. Timing, pace notes and a G meter in one app.
Drive responsibly. Clutch never suggests, displays or announces a recommended speed, and it does not encourage speeding. It is a timing and note-taking tool for track days, closed roads and private property. Always obey traffic laws and local regulations, and keep your eyes on the road.
Clutch is built around one loop: prepare a route, drive it, then study exactly what happened at every corner.
No track required. Start driving and get live timing, speed, distance and a G reading on any road — permanently free, never counted, never gated.
Drive the route once to record it, or import KML / GPX from Files, Mail, iCloud Drive or any app that can share a file. You can also just paste coordinates as text.
No hand-written notes. From the recorded or imported geometry Clutch finds every corner for you — which way it goes, how tight it is, and how far it is from the next one. See them all on the map and in a list, then rehearse the whole route or play a single callout.
During a run Clutch speaks each corner before you reach it, so you can look through the corner instead of at a screen. Notes are generated from your own route geometry.
Timing begins on a measured start-gate crossing, not on a button press — so your lap time reflects the lap, not your thumb. Laps, best lap and segment (point-to-point) timing included.
A friction-circle G meter with 1.5 / 3 / 5 / 8 G ranges and reference rings, altitude and heading, and a live microphone sound-level meter. Free, all of it.
Measure acceleration runs and braking distance with the same GPS engine that times your laps. A straight, repeatable measuring stick for the car itself.
After a run: speed and G at every corner, a speed chart, a G chart, a colour-coded trace on the map, and a replay you can scrub through.
Every run is kept on your phone. Export your data as a file you own, or turn a lap into a share card image.
Same track, different conditions — compare a surface you have driven before against today, so you can see what the weather actually cost you.
The interface speaks English and Simplified Chinese. English is the default.
No cloud, no account, no ads, no analytics and no third-party SDK. Your routes, runs and measurements stay on the device, and you can delete them at any time.
The parts you need to decide whether Clutch is worth it are free, permanently — including the corner analysis and route preview. Pro is a single one-time purchase: it unlocks unlimited timed runs and tests. There is no subscription, now or later.
| What you get | Free | Pro |
|---|---|---|
| Free Roam timing on any road | Unlimited | Unlimited |
| Record a track · import KML / GPX | Unlimited | Unlimited |
| Corner analysis & route preview | Unlimited | Unlimited |
| Play a callout · rehearse the route | Unlimited | Unlimited |
| G meter · altitude · sound level | Unlimited | Unlimited |
| Timed runs on a saved track, with voice pace notes | 5 runs | Unlimited |
| 0–100 and braking tests | 3 tests | Unlimited |
| Run history | Most recent run | All runs |
| Data export · share cards | — | Included |
| Per-corner G recording while driving | — | Included |
| Wet / dry comparison | — | Included |
$29.99 one-time. Not a subscription, and it does not renew. Family Sharing is supported. A free run is only counted once the run has actually finished and at least three pace notes were announced — opening a run and closing it again costs you nothing.
1. Tap Tracks and record the route you drive, or import a KML / GPX file. 2. Check the corner list and rehearse the route indoors. 3. On the road, open Drive, pick the track and arm at the start gate. 4. After the run, open Review for corner speeds, the charts and the replay.