miauu's GridAxisPainter is a 3ds Max script from developer miauu that sets different colors for the major X, Y, and Z axes in any viewport. Each of the three major axes can be given its own color.
The script supports Autodesk 3ds Max and 3ds Max Design releases 2020, 2021, 2022, 2023, 2024, 2025, and 2026, covering a broad range of installations. It is offered at version 1.0, with its most recent update recorded on 20 October 2025. That supported range spans older releases through to the current ones.
GridAxisPainter is listed here as free. A demo video is available, and further information is on the developer's page. The tool stays focused on one task: coloring the major grid axes in the viewport.