Hole19 for iOS works with iOS 14 or above (iPhone 6S and later). The App is optimized for iPhone 8 and above and includes compatibility with Apple's Health app.
Hole19 for Apple Watch requires at least watchOS 6.
If you have a GPS-enabled iPad, make sure to search for Hole19 within the iPhone apps, as the app is not customized for the iPad.
The Android version is optimized for devices running Android 5.0 Lollipop (API 21) and above with a screen resolution of at least 800 x 480 pixels.
The App is not compatible with Android Tablets.
Hole19 is compatible with smartwatches running Wear OS by Google. If your smartwatch runs a proprietary Operating System like Tizen by Samsung or any other one, then it won't work with Hole19.