Free
In-App Purchases
About
This app transforms your iPhone into a sophisticated golf green reader. It accurately maps slopes, calculates break, and measures green speed, helping you visualize your putt and improve your putting score. Designed for golfers of all levels, it offers offline functionality and integrates seamlessly with iPhone features.
✓Vertical line from phone sensors
✓Maps putt slope and break
✓Measures green speed (Stimp)
✓Calculates strokes gained putting score
✓Offline functionality
✓iPhone Lock Screen and Dynamic Island integration
✓VoiceOver and Dynamic Type support
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What's New in Plumb Bob
1.0.2
October 13, 2026
Try Plumb Bob Pro free for a week straight after the intro, or carry on with your three free reads. Plus small improvements.
2
Subscriptions & In-App Purchases
Plumb Bob Pro (Monthly)
Unlimited reads, rounds, stats and history.
$9.991 Month
7 Days trialUser reviews
Developer apps
FAQ
How does Plumb Bob help me read greens?
Plumb Bob uses your iPhone's sensors to create a truly vertical line, mapping the slope and break of the green. It helps you visualize the putting line, aim spot, and how the putt will play.
Can Plumb Bob measure green speed?
Yes, Plumb Bob can measure green speed (Stimp) by rolling a ball 8-15 feet. You can also select pre-set speeds like Slow, Medium, Fast, or Tour.
Does Plumb Bob offer a putting score?
Yes, you can play a round and have every putt read scored against a tour putter using strokes gained. This helps you identify areas for improvement.
Is Plumb Bob available offline?
Yes, Plumb Bob is designed to work offline. All calculations are performed on your phone, and it collects no data, ensuring privacy.
What are the subscription options for Plumb Bob Pro?
Plumb Bob Pro offers monthly and annual subscription plans. Both plans include a 7-day free trial. The monthly plan is $9.99/month, and the annual plan is $59.99/year.
Does Plumb Bob have ads?
No, Plumb Bob does not contain advertisements. The app is free to use with optional in-app purchases for Pro features.
What devices does Plumb Bob support?
Plumb Bob is built for iPhone and also supports Apple Watch, iPad, and features like Lock Screen widgets and Dynamic Island integration.
Is Plumb Bob suitable for beginners?
Yes, Plumb Bob is designed for golfers of all levels. The demo green allows you to try it out without going to the course, and measuring green speed is always free.
