GUI Inspector lets you inspect the GUI elements of any Minecraft screen. You can view a tree of all widgets and components on a screen, including their class names and properties. Class and method names are mapped to Yarn mappings, with intermediary available if needed.

Selecting an element outlines it in-game so you can easily identify it. You can also enable Inspector Mode to click directly on an element in-game and have it highlighted in the tree. If the element view isn't enough, you can capture draw calls and inspect their properties and call stacks directly.

You can also manipulate elements. You can remove them from the screen or modify their properties, including most immutable properties.

Plans for the future