This is what package name and where can i get other app package name?

[shinewanna]

calshow://
fb://
whatsapp://

[yourshinsuke]

it is better
http://sanya.hzhbcjq.com/packages/installed_apps/example

[ghost]

it is better
http://sanya.hzhbcjq.com/packages/installed_apps/example

but that is only for android

[leopries]

Most URLs for iOS are exactly the app name. If you know which apps you want to support before release you can just try out the URLs in Safari on an iOS device. (for example twitter://, instagram://, xing://, tiktok:// all work fine)

[ShaneZhang-tw]

This can help to add custom url for iOS. https://www.amerhukic.com/finding-the-custom-url-scheme-of-an-ios-app