Know your angle.
Before you roll.
Lean turns your iPhone into a live inclinometer that makes your vehicle’s angle easy to read at a glance — how far you’re pitched and rolled on every climb, descent, and side-slope. Set your own limits, and Lean warns you, amber then red, as you near them.
Free on the App Store.
What it does
A faster way to read your angle.
A traditional inclinometer leaves you reading two gauges and doing the math in your head. Lean shows roll and pitch together in a single view, so you take in your vehicle’s angle in one look — which way you’re leaning and how far, with no numbers to interpret and no plus-or-minus signs.
Vehicle angle at a glance
Lean shows roll and pitch together as one clear picture of how your vehicle sits — climbing or descending, canted left or right. The whole situation reads at once.
Simple angle readouts
Roll and pitch read as clean whole degrees — a plain “12°”, never a “−12°” to decode. The display carries the direction; the number tells you how far. It’s the gauge convention off-road drivers already know.
Rollover awareness
Set the warning angles that suit your rig, and Lean alerts you the moment you approach your limits.
Beyond the angle
An early warning, built in.
Lean doesn’t just show your angle — it watches it. Set a caution angle and a limit angle for each axis: reach the caution and the screen turns amber, reach the limit and it turns red, each with haptics you feel without looking down.
Roll is the axis that matters most.
Most rollovers are lateral, so roll deserves the closest attention. Lean tracks roll and pitch together and drives the warning from whichever sits nearer its limit — clear on screen and in your hands.
How it works
Mount it, zero it, go.
No GPS, no calibration drive, no account. Lean reads gravity straight from your iPhone’s motion sensors — the moment you’re parked level, it’s ready.
Mount it
Put your iPhone in a dashboard or vent mount in portrait. Any fixed position works.
Zero on level ground
Park level and tap Zero once. Lean records your reference and measures every tilt from there.
Drive the trail
Watch your angle change with the terrain. Lean warns you well before you reach your limits.
Privacy
Nothing leaves your device. Not even your location.
Lean is a pure motion app. It reads gravity from your iPhone’s sensors and nothing else — no GPS, no network, no account. Your measurements never leave the phone.
No account. No signup. No internet connection. No location permission.
- Motion data is processed entirely on-device, for app functionality only.
- Lean requests no location and uses no GPS.
- No data is transmitted off your device.
- No third-party SDKs and no analytics of any kind.
- Your zero reference and settings can be cleared at any time from the Settings screen.
This page serves as the privacy policy for the Lean iPhone app.