Undula: LiDAR Green Reader
Read Putts: Break & Slope AR
Only for iPhone
Free
iPhone
Scan the green with LiDAR, tap the ball and the cup, and see the line, where to aim and how the putt plays — right on the ground in AR.
Read the green before you putt.
Undula uses the LiDAR Scanner on iPhone Pro to scan a putting green and lay a height or slope map right on the ground in AR. Tap the ball and the cup, and Undula shows you the line.
WHAT YOU SEE
• Distance — in meters or yards, and in putter lengths
• Uphill or downhill — the height difference between the ball and the cup
• The predicted line — the path the ball rolls when hit to finish 40 cm past the cup
• Where to aim — how many cups left or right of the hole
• Plays-like distance — how long the putt would be on flat ground
• Max break — how far the ball curves away from the straight line
READ THE GREEN AT A GLANCE
• Height and slope color maps with adjustable sensitivity
• Downhill arrows with a glow that flows the way the ball will roll
• Putter-length and cup-size grids, aligned to your aim line
• A grid that reveals the undulations while you scan
• Top view — look down on the whole green, pinch to zoom, tilt it in 3D and place the ball and cup precisely
BUILT FOR REAL GREENS
• Physics-based putt simulation that accounts for every slope along the line — double breaks, tiers and large undulations included
• Adjustable green speed (Stimp 6–14 ft)
• Precision calibration: lay your iPhone on the green to measure the true slope with its motion sensors and correct LiDAR tilt
• Bags, flagsticks and feet are filtered out automatically, and lines over scan errors are hidden instead of guessed
HOW IT WORKS
1. Slowly scan from the ball to the cup.
2. Tap the ball, then the cup.
3. Read the line, the aim and the plays-like distance.
GOOD TO KNOW
Requires an iPhone Pro with a LiDAR Scanner (iPhone 12 Pro or later). Results depend on scan quality; grass grain and wind aren't modeled.
PLAY BY THE RULES
Measuring slopes with an electronic device during a competition round breaks Rule 4.3a of the Rules of Golf. Use Undula on practice greens, in practice rounds and in casual rounds.
PRIVACY
No account, no ads, no tracking. The camera and LiDAR are used only on your device to scan the ground — nothing is recorded or sent.
Questions or feedback: xhoto.apps@gmail.com
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Jaewoong Choi, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Jaewoong Choi
- Size
- 2.7 MB
- Category
- Sports
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
• iPhone 6S
• iPhone 6S Plus
• iPhone SE (1st generation)
• iPhone 7
• iPhone 7 Plus
• iPhone 8
• iPhone 8 Plus
• iPhone X
• iPhone XS
• iPhone XS Max
• iPhone XR
• iPhone 11
• iPhone 11 Pro
• iPhone 11 Pro Max
• iPhone SE (2nd generation)
• iPhone 12 mini
• iPhone 12
• iPhone 12 Pro
• iPhone 12 Pro Max
• iPhone 13 Pro
• iPhone 13 Pro Max
• iPhone 13 mini
• iPhone 13
• iPhone SE (3rd generation)
• iPhone 14
• iPhone 14 Plus
• iPhone 14 Pro
• iPhone 14 Pro Max
• iPhone 15
• iPhone 15 Plus
• iPhone 15 Pro
• iPhone 15 Pro Max
• iPhone 16
• iPhone 16 Plus
• iPhone 16 Pro
• iPhone 16 Pro Max
• iPhone 16e
• iPhone 17 Pro
• iPhone 17 Pro Max
• iPhone 17
• iPhone Air
• iPhone 17e
• iPhone 18 Pro
• iPhone 18 Pro Max
• iPhone Duo
- iPhone
- Languages
English and 7 more
- English, French, German, Japanese, Korean, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- Copyright
- © 2026 XHOTO