Thanks for your post.
You should check per app what are the ones published to the open with a link by looking at the published documentation like https://developer.apple.com/library/archive/featuredarticles/iPhoneURLScheme_Reference/Introduction/Introduction.html
These are a few to make a phone call or send a message like
Or to open Apple Maps
maps:// and https://maps.apple.com/?...
Also you should looks at the Universal Links as some have an AASA file to open those like:
- Universal Links to
music.apple.com, podcasts.apple.com, tv.apple.com, books.apple.com
Always check if the scheme is documented on developer.apple.com, or there's an official UIKit/EventKit/MapKit/StoreKit/MessageUI API for it, use that. If it's not documented and you only found it via a GitHub gist or reverse-engineering, treat it as unsupported.
If you tell me which specific Apple app/action you're trying to deep link into, I can point you to the framework or documented schema or API.
Albert WWDR