WaxAlert can be pre-installed on iPhone prior to it being on the App Store.
Important: This only works from Safari (not Chrome).
Open the WaxAlert App in Safari:
app.waxalert.com
Tap Share (the square with the up arrow near ther Safari search bar).
Scroll up and tap Add to Home Screen, then tap Add.
That’s it. You’ll now see the WaxAlert icon on your Home Screen like any other app and you're a tap away.
If you don’t see Add to Home Screen, you’re probably not in Safari.
Copy the link and open it in Safari.