UWPSpy

An inspection tool for UWP and WinUI 3 applications. Seamlessly view and manipulate UI elements and their properties in real time.

Usage

Download the latest release from here.
Run UWPSpy.exe and select the UWP/WinUI 3 application you want to spy on.
A window with the application's UI elements will appear for each UI thread of the target application.

Demo

Click on the image to view the demo video on YouTube.

Supported Windows versions

UWPSpy uses the XAML Diagnostic APIs which were added in Windows 10, version 1703. Earlier versions of Windows are not supported.

References

The ExplorerTAP part of the TranslucentTB project. That's the only usage example of the XAML Diagnostic APIs I could find on the internet.
Ahmed Walid (ahmed605), thanks for helping with many UWP-related questions.