No app store, nothing to update. It installs straight from the website in about 10 seconds, opens full screen like any other app, and is always the latest version.
Scan with your phone
Point your phone's camera at the code to open this page there, then follow the steps for your phone.
IPHONE AND IPAD
Open playsheet.tech in Safari.
Tap the Share button (the square with the arrow pointing up).
Scroll down and tap Add to Home Screen.
Tap Add. Playsheet shows up on your home screen.
ANDROID
Open playsheet.tech in Chrome.
Tap the ⋮ menu in the top right.
Tap Install app (or Add to Home screen).
Tap Install. Playsheet shows up with your other apps.