iOS prototyping encompasses the entire world of iPhone & iPad development. Typical desktop software includes the likes of Illustrator of Sketch – but now there’s AppStarter as an alternative.
The benefits of AppStarter is that you’ll be able to create native iOS applications on top of their system. You can grab the native iOS app for local testing on an iOS device.
Here’s a brief rundown copied from the AppStarter website:
I recommend skimming through the AppStarter documentation for more info.
You can alternatively dive in head-first by signing up for a free account and testing the waters on a new project.