A PWA is a good alternative to a native iOS or Android app.

PWA's have the same functionality as a native app, possibly more. They are accessible via a phones browser rather than having to be downloaded from an app store.

Your clients will just need to click on a link from your website and they will be immediately directed to your PWA. They can then save it to their home screen in a matter of seconds. Here they can access loyalty cards / rewards schemes, booking, galleries, reviews etc…