Axo Measure tool
AxoTools 23.0.2 adds a new tool that acts as both an axonometric ruler as well as a protractor. It allows you to measure distances and angles in any of the three axonometric axes, scaled for the foreshortening factor of that plane, whether its projection is isometric, dimetric, or trimetric. Measurements are displayed for all axo planes as well as orthographic.
The tool is automatically constrained along your current axonometric axes, or press Shift to constrain to the nearest 45°, or press Alt/Option for no constraints at all.
In the Info panel, choose a set of measurements to display, or choose “Auto” to let the tool guess what you’re measuring based on the direction you drag the mouse. Choose “All” to see all results in fields where you can copy values to paste elsewhere.
To use the tool, simply click and drag to measure a distance and an angle. To measure the difference between two angles on an axonometric plane, click once to set an anchor point, then drag an arc from one point to another.
The free update is available for Adobe Illustrator CC 2019, 2020, 2021, and 2022.