The iPhone app is on the App Store. The Google Play listing is still in review, so on Android
install it from Chrome below: the same app on your home screen today.
Open the downloaded file. If asked, allow installs from your
browser (Settings → Allow, then go back).
If Google's Play Protect says "Unsafe app blocked", tap
More details → Install anyway. It warns because this file bypasses the
Play Store. The Google Play listing above is the proper route once it is live; the
Chrome install skips all of this too.
Tap Add to Home Screen, then Add. Done: full screen,
its own icon, like any other app.
Open roadworthyfleet.co.uk/app in Safari on the iPhone.
Tap the Share button (the square with the arrow).
Tap Add to Home Screen, then Add.
Apple only allows true one-tap installs through its App Store, and the
listing above is in review. This is the same app, on your home screen today.
Computer
On the desktop
Open roadworthyfleet.co.uk in Chrome or Edge and
click the install icon at the right end of the address bar. Roadworthy opens in
its own window, on your taskbar like any program.