iOS / Windows Store App: can I know whether my other app installed on this device/user account?

Question

I have several apps and I want to know from app A whether app B or C are installed. In Android I can check does package exist, but is there something like this in iOS and windows store app? I'm using Xamarin for iOS.

Answer 1

You can use system Keychain to achieve this. Values in system Keychain can be shared between collection of apps and you can set values like isAppBExists and isAppCExists to true/false in this apps. And then check this values in app A

Link to documentation

Answer 2

For iOS you can get your apps to confirm unique URL schemes and check whether they can be opened.

References:

URL schemes - https://www.appcoda.com/working-url-schemes-ios/

Can open url - https://developer.xamarin.com/api/member/UIKit.UIApplication.CanOpenUrl/p/Foundation.NSUrl/

Answer 3

For UWP app, you can use PackageManager.FindPackagesForUser Method to find all packages installed for the specified user.

See the following similar topic:

how to get list of all installed apps and run them in UWP WinRT 8.1

Get List of installed windows apps