On your phone
The desk, in your pocket.
Apple’s store and Google’s store list a signed app filed in the maker’s name. That filing is not in, so a store badge here would be a false door. What you can do tonight is put the desk on the home screen. Same scores. Same films. No second account.
iPhone
Add to the home screen
Open the desk in Safari. The next screen shows the share button, then Add to Home Screen. It then opens like an app, with the score on the icon.
Install on iPhoneAndroid
Install the desk
In Chrome, install it from this page. If the button is quiet, open the menu and choose Install app, or Add to Home screen.