It is possible if the app has it's own URL scheme and other app knows about that. Let's say I make an app Foo which supports "foo://" and you make an app Bar. You can ask iOS does any app recognize "foo://" and if so, then open it.

So as it currently works on iOS you cannot say to OS: hey, I want to use this app for http, instead you check if there is an app that handles "googlechrome(s)" scheme, and if yes you can replace your http(s) in URI to googlechrome(s) and then it will open in Chrome instead of Mobile Safari.

It needs to be done in each app, by bypassing the system web browser or maps support. So Google may support it in their apps, but Apple doesn't in the system apps like Siri, Contacts, etc.

Yea I was very pleasantly surprised to see this worked when I switched back to ios from android. It allows me to stay within the google maps, gmail, and chrome ecosystem most of the time.

But that's only from within the Google ecosystem. Click on on a link in a non-Google app and you won't see Chrome as an option.

Well, you actually _will_ in quite a lot of apps these days, which is really a symptom of the problem.

I think Google has an SDK to allow other developers to do this on iOS. Unfortunately I don't think many iOS developers know or care.