There is nothing to download and no account to create: your phone pins the app, which then opens full screen like any other. Booking and payment work exactly the same.
On iPhone and iPad (Safari)
1Open this site in Safari.
2Tap the Share button at the bottom of the screen.
3Choose “Add to Home Screen”.
4Confirm: the coWo icon appears among your apps.
On Android (Chrome) and on desktop
1Open the browser menu (⋮ or the install icon in the address bar).