Question regarding URL change

What happens to the apps saved on the home screen when you change the URL of an app?

Technically they would eventually stop working.

What does that look like exactly when clicking the app from the home screen?

After the original URL was changed…

I’d have to try it to find out. You could probably try it by creating a quick app, publishing it, installing it, then change the url to see what happens. If it’s like visiting a dead url in the browser, it would probably say “Not Found”. Otherwise, it may just sit and spin like it’s trying to open the app.