You can use the app on three devices with a single account and single subscription, regardless of whether this is Apple, Android or Windows. You can download the Windows software here.
How to remove paired devices
Would you like to use the Waterkaarten app on another device, but have you reached the maximum limit? You can easily disconnect a paired device:
Open the app and tap the profile icon in the right corner next to the search bar
Under ‘Devices’, go to ‘Paired phones/tablets’. Here, you can see a list of all active devices linked to your account
Tap the trash can icon (or the name of the device) next to the device you want to remove
Confirm your choice by tapping ‘OK’ in the ‘Forget device’ pop-up
The device is now disconnected, immediately freeing up a slot for your new device.