Please search for VISYT in the Google-Store or the Play-Store. The app is available for both iPhone and Android. The right app in the store has the VISYT logo, one eye and the lettering in green and blue.
The app is easy to use and only needs to be downloaded if you want to make ratings yourself or add photos to the menu card where none are available yet. All other functions also work via the web app, which does not need to be downloaded.
You need an internet connection to use the app properly! Ask the restaurant for WiFi access.