Observed arrival · 2026-10-07
OpenRoll measures green speed with a phone
OpenRoll describes an app that uses video of a putt to estimate a golf green’s speed and slope.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Golfers checking practice-green speed
- Worth noticing
- Two putts in opposite directions are intended to account for slope; the page says readings also include the line’s tilt.
Field notes
The instructions specify a level, overhead phone position and a marked start circle and target box; the stated measurement relies on ball deceleration rather than the force of the putt. The page says course outlines are built into the app for course identification without a signal, and that course readings are shared anonymously unless sharing is disabled in Settings.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
$PaidCommerce or pricing visible
◎NicheUnusually specific use
One card from the complete issue