Is Slopegraide legal for tournaments?

No.  The Slopegraide app has the ability to show you where to aim putts on the green, which goes against the rules on equipment in the USGA Rules of Golf.  Slopegraide was designed to be used for as a training aid for practice and recreational rounds of golf only.

What are the dimensions of the Slopegraide sensor?

The Slopegraide sensor is approximately the size of a poker chip with a diameter of 1.75 inches and a depth of 0.5 inches.  The mass of the sensor is 30 grams.

What is the battery life of the Slopegraide sensor?

The Slopegraide sensor battery lasts approximately between 6 and 8 hours, or up to two rounds of golf.  It takes 90 minutes or less to fully recharge your sensor.

Is the Slopegraide sensor waterproof?

No.  The case of the Slopegraide sensor is water-resistant, however we strongly do NOT recommend using the Slopegraide sensor if it is raining or in extremely wet conditions.

Do I need a specific iOS or Android device to use the Slopegraide app?

The data below shows a set of minimum and recommend requirements to use the Slopegraide app.  While the app does not require a specific iOS device, this may be subject to change as the Slopegraide app evolves with future updates.

NOTE: The Slopegraide Android app is currently under construction and estimated to be complete in late spring 2022.  Support for Android smart watches is coming soon!



iPhone SE (1st generation) or newer

iOS 12.4 or newer


Apple Watch

Apple Watch 2 or newer

watchOS 5.0 or newer




iPhone 11 or newer

iOS 14.4.2 or newer


Apple Watch

Apple Watch 5 or newer

watchOS 7.0 or newer

Does the Slopegraide app require a subscription?

Your experience will be much better with a Slopegraide Premium app subscription.

The free version of the Slopegraide app shows you the slope of the green in slope degrees only.

With a Slopegraide Premium subscription, you will have access to many more features of the Slopegraide app, such as our visual rolling putt model, recommended start lines, displayed slopes in slope percentages, configurable green speed, putt speed, uphill/downhill elevation, using Slopegraide with your Apple Watch, and our NEW visual putting stroke model!

How much does a premium subscription cost? 

There are three different pricing options for a premium subscription in the Slopegraide app:

The first option is a monthly subscription for $9.99 USD per month.

The second option is an annual subscription for $99.99 USD per year.  An annual subscription provides unlimited access to all features in the Slopegraide app for 1 year, including Roll Maps™, our color-coded putt speed charts that are legal for tournament play!  You will get a 7-day FREE trial when selecting this option.

The third option is a LIFETIME subscription for $299.99 USD.  A lifetime subscription provides unlimited access to all features in the Slopegraide app for life.