Fitune is a web application, and there's no need to download it from the app stores (this can be a barrier for new people to register for your app).

However, with a simple link or a QR code, your customers can access your web application. If they wish to have direct access, they can download and save it to the home screen on any device

In Safari or another browser enter the business's URL: myfitune.io/yourbrand
At the bottom of the browser, tap on "Share."
Select "Add to Home Screen."
Tap "Add."

In Google Chrome or another browser, the business's URL: myfitune.io/yourbrand
In the top right corner of the browser, tap the menu.
Select "Install app" or the option "Add to home screen."
Tap "Install."

In both cases, it should install the app on the home screen.