You can test for Native iOS Apps easily! No SDK required!
Start setting up your study, and be sure to choose Native iOS:
On the next screen, you'll need to supply the URL to your app in the App Store. Just replace the placeholder text here:
This will take your participant right to your app in the App Store as soon as the screen sharing is started.
During the screen share, as the moderator, you can see everything on their phone. If you want them to show you another app they use, they can press the home button and go to any app they wish. You as a moderator see all of this, allowing you to test with other apps on the user's phone.