Best way to cast iPhone screen to Mac as iPhone mirroring app not working

Fast Cast is a free utility app, available on both the iOS App Store and the Mac App Store, that was specifically built to help you cast iPhone screen to Mac (or to other devices like iPads and iMacs) . It is designed to be an "easy-to-use screen casting application" for situations exactly like yours—when the built-in Apple mirroring tools aren't working or aren't available.

The developer describes it as straightforward: you install it on both your iPhone and your Mac, and it handles the connection between them.

The process to cast iPhone screen to Mac using Fast Cast is fairly simple, based on the official feature list:

Step 1 – Download the apps

Step 2 – Open both apps

Step 3 – Connect and mirror

   Use the iPhone app to scan for your Mac device

   Once detected, start the screen projection

   Your iPhone screen should appear on your Mac display

The app includes three main features that are relevant for you :

1. Scan and project – The iPhone app can discover your Mac automatically

2. Network-less support – This is a big one; it works even without a WiFi network connection

3. Recording and screenshots – The Mac client lets you capture video or still images of your mirrored screen (though this is more of a bonus than a core need for simple casting)

The most important thing about Fast Cast—and the reason it might work when the built-in iPhone Mirroring app doesn't—is its "support for network-less environment for projection".