Window VQA is a free Android utility tool developed by wdziemia that allows for easy debugging of app layouts. With just a single long press of the home button, Window VQA overlays helpful tools such as rulers (both vertical and horizontal), pixel grids, grid columns, and grid rows onto the screen.

This app also allows for easy navigation through the view hierarchy with a simple double tap to "dig" all the way up to the root. Additionally, you can single tap to view the width and height of a View/ViewGroup, as well as the distance from the edge of the screen. Finally, pinch to zoom in and see more details.

Window VQA is compatible with Android 9.0 and does not require any additional libraries to be imported into your project. If you encounter any bugs or have feedback for the developer, simply use the "Send Feedback" option in the settings. For more information on privacy, check out the app's privacy policy on the wdziemia website.