An open-source application which is a “PC Health Check” replacement has been released.
Microsoft’s PC Health Check app checks your computer’s hardware and tells you if it is compatible with Windows 11. Unfortunately, unless it returns a result showing your computer is compatible, it is not as informative as it could be.
The application, called WhyNotWin11, determines if your hardware is compatible with Windows 11 and as you can see from the screenshot, WhyNotWin11 gives more detailed and helpful information.