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GridScore is a so-called Progressive Web App (PWA), which means that it’s basically a website, but on phones and tablets it can be installed to work offline. The mechanism for installing a PWA on your device will vary depending on the operating system. On Android a banner will appear at the bottom of the screen prompting you to install the application. On iOS, press the share icon and then add the app to your home screen.

To check out GridScore visit the website at:

Or install the Android app from Google Play:

Here are some resources that show you how to install a PWA on your device: