Lean angle
Roll + yaw + Doppler speedAn accelerometer alone cannot reveal motorcycle lean in a balanced turn. Slipangle combines fast gyroscope response with the stable geometry of the turn.
iPhoneMotorcycle / car / quad
Ride telemetry
you can believe.
Slipangle records the road with the sensors already in your iPhone. Lean, speed, g-force, elevation and the route — measured for the ride, not reconstructed for a pretty map.
See how it measures
Built for iPhone · in development
Sample ride / 04Sunday, 07:42
measuredDistance86.4 km
Vmax112 km/h
Max lean43°
00 Definition
What is Slipangle?
Slipangle is an iPhone ride telemetry app for motorcycles, cars and quads. It records Doppler-based speed, fused lean angle, longitudinal and lateral acceleration, barometric elevation and route quality. It is made for post-ride analysis, not navigation, leaderboards or a social feed.
One tap starts the ride. The screen can go dark. When you stop, the route, charts and peaks are waiting — along with a visible note wherever data had to be estimated.
01 Measurement
GPS has one job.
Lean angle isn’t it.
A route is not telemetry. Slipangle gives each sensor the work it is good at, then rejects samples that do not pass its quality gates.
Speed
Doppler velocitySpeed is never calculated from the distance between two GPS points. A position jump after a tunnel does not become a 500 km/h personal best.
Elevation
Barometric changeGPS altitude is too noisy for a useful gradient. Relative pressure change gives the road profile the precision it needs.
02 After the ride
One ride.
More than a line on a map.
Scrub a chart and the same moment moves on the route. Read the channels together, compare left and right, or isolate a stretch worth understanding.
Recorded channelSample traceDisplay unit
01Speed
km/h02Lean angle
°03Longitudinal
g04Lateral
g05Elevation
mPlus route quality, grade, distance, moving time and curviness.Raw channels remain separate.
Touch one moment. See it everywhere.
The chart cursor, route position and metric readout stay locked to the same timestamp. No hunting through separate screens to work out where a peak happened.
Peaks are part of the point.
Downsampled charts preserve meaningful extremes instead of averaging them away. The quieter line is not automatically the truer one.
Your data is not trapped in a screenshot.
Slipangle Pro exports GPX routes, CSV telemetry and complete JSON metadata for the rides you want to inspect elsewhere.
03 Vehicle logic
Same phone.
Different physics.
A motorcycle, a car and a quad should not be reduced to the same dashboard with a new icon. Slipangle changes what it measures and what it puts first.
Motorcycle
Lean is the headline.
Left / right leanSlipangle follows roll and turn dynamics instead of guessing an angle from the shape of a GPS route.
Car
G-force gets the full width.
Longitudinal / lateralLongitudinal and lateral acceleration lead the analysis, with launches, braking and cornering kept as separate channels.
Quad / ATV
Different machine, different physics.
Tilt / terrainTilt, terrain and barometric elevation replace motorcycle assumptions that do not apply off the tarmac.
04 Product principles
The road
is yours.
No Slipangle account. No advertising. No public speed ranking. Core ride recording works offline, ride files stay on the device, and optional sync uses the Apple ID already on it.
No navigation ballast
Slipangle records where you went. It does not tell you where to go.
No data theatre
Measured, degraded and estimated data remain visibly different.
No public competition
Your numbers are for analysis and self-assessment, not a road leaderboard.
05 Release standard
Built carefully.
Released when the numbers hold up.
Slipangle is in development for iPhone. Reference rides, tunnel tests, mounting tests and battery tests come before launch. “Should work” is not the bar.
iOS firstNo release date announcedslipangle.app
Slipangle records what you do. It does not make it safe.
Ride within your limits, not within your stats.