GreenLies

See the break before you hit it.

Scan the green with your iPhone's LiDAR. GreenLies traces the line and tells you where to aim and how hard. Every putt you log teaches it your greens.

In development · iPhone and iPad with LiDAR · iOS 17.5 and later

Example read
●Aim 6 in right

12.4 ft putt · plays like 13.1 ft
1.4 cups · 1.6 in uphill · 2.1% side slope

How it works

Three taps to a read.

  1. Tap your ball

    Point the camera at your ball on the green and tap it.

  2. Walk your line

    Walk to the cup along the putt. LiDAR maps the green as you go. Tap the cup.

  3. Read it

    GreenLies rolls a ball across the scan until it finds the line that drops. You get the aim, the pace and the path.

The read

Where to aim. How hard. Why.

The card leads with the call: aim 6 inches right, or aim at the cup. Under it sit the putt length, what it plays like, the break in cups, the rise or fall and the side slope.

If the scan is thin, it says so. Walk the line again and the read sharpens on the spot, because it rebuilds every second while you look at it.

●Aim 6 in right

12.4 ft putt · plays like 13.1 ft
1.4 cups · 1.6 in uphill · 2.1% side slope

Last putt: 1.2 ft long, 3 in left. Medium greens: Stimp 10.6 from 4 putts

Medium · Stimp 10.6 Full

Example of the read card. Numbers will vary with your green.

Four views

See as much or as little as you want.

Switch views from the chip under the card. The read stays the same; only what's drawn on the green changes.

Full

Line, slope and every number.

PathAim spotSlope gridNumbers

Line

Ball path and aim spot.

PathAim spotSlope grid

Aim Spot

Only where to aim.

Aim spot

Numbers

The read, nothing on the green.

Numbers

Slope grid

Water runs downhill. So does your ball.

A grid drapes over the scanned green, every 6 inches by default, with an arrow at each crossing pointing straight downhill. The color tells you how steep it is.

  • Under 1%Barely moves it
  • 1 to 2%Plays a little break
  • 2 to 3%Real break, mind the pace
  • Over 3%Steep, the ball will run

It learns your greens

Every miss makes the next read better.

Start with how today's greens feel. Log where a miss stopped and GreenLies works out the green speed and break strength that would have put it there. Recent putts count most, so it keeps up with the course you're playing.

Then it gets straight back to work. The ball moves to where it stopped and the read for your next putt is ready.

Everyone's ball

A read for every ball on the green.

Add your playing partners' balls, each in its own color. Every ball gets its own path and aim spot, and a chip with its aim at a glance. Pick any color for yours with the color wheel.

White golf ball
Ball 1 Aim 6 in R
Yellow golf ball
Ball 2 Aim Cup
Orange golf ball
Ball 3 Aim 1.1 ft L
Pink golf ball
Ball 4 Aim 3 in L

Balls rendered by the app. Aims are examples.

Built for the green

Reads the real green
LiDAR builds a height map every 5 cm along your putt and smooths out the noise. Feet and bags get ignored.
Physics, not a guess
A rolling-ball model with green speed on the Stimpmeter scale. It adjusts aim and pace until the putt drops.
Undo anything
Mis-tapped a ball, the cup or a result? Undo takes it back, including what that putt taught it.
Your units
Feet and inches or meters and centimeters.
Nothing collected
No account, no ads, no analytics. The app makes no network connections at all.

Walk the line. Trust the read.

GreenLies is in development for iPhone and iPad with LiDAR.