We have written a simple but powerful utility that will mirror any window on your Mac with a hotkey. This allows you to use your favorite software as a teleprompter, such as MS Word, PowerPoint, or any text editor or web browser.

Instructions: First, run the utility, then switch to any program you want to create a mirror image of. Press the control-option-command-M hotkey and it will flip. Press the hotkey again to switch back to normal.

Download Mirror Flip Mac Utility

Installation Tips:
Note that you have to enable Screen Recording in Security & Privacy -> Privacy

How to open apps not from Mac App Store

By default macOS allows you to open apps from the official App Store only. If you have this still set as your default you will be seeing the warning when you try to open an app for the first time.

Luckily you can make a simple change to your settings that will allow you to open some third-party apps that aren’t on the App Store. It won’t mean that you can open every third party app without issue, but it will certainly mean you see fewer warnings.

1. Open System Preferences.
2. Go to the Security & Privacy tab.
3. Click on the lockand enter your password so you can make changes.
4. Change the setting for ‘Allow apps downloaded from’ to ‘App Store and identified developers’ from just App Store.

You’ll still be prevented from opening anything macOS doesn’t recognise, but at least you will be able to open apps that weren’t purchased from the App Store, assuming that they don’t have malware and they are signed by a developer Apple recognises and trusts.