CNC Kitchen released version 0.11.2 of ScanRuler on November 11, 2026, a web application for inspecting 3D scans. New is a curvature comb that shows on curves whether the contour is a true circular arc.
ScanRuler runs in the browser and requires no installation. According to the developer, your files stay on your computer as long as you don't connect an AI agent. The source code is under the AGPL license; the project description does not state a price.
What can ScanRuler do with a scan?
In the 3D Measure section, you place spheres, cylinders, planes and other basic shapes on the surface and measure distances and angles between them, with tolerances if desired. Deviation aligns the scan to a CAD part with Align automatically and colors the deviation as a color map; the mouse pointer shows the values. Find volume errors lists areas with too much or missing material. The wall thickness section colors thin spots red.
In 2D Measure, you measure flatbed scans of flat parts and export the sheet as SVG or DXF. Reverse engineer builds a solid body from the scan, which CAD opens as a STEP file like a component. Mesh Tools fills holes, smooths and reduces the triangle mesh and fits a replacement piece to the break point of a broken part. According to the project description, ScanRuler reads STL, PLY, OBJ, 3MF and STEP. An STL file has no unit, which is why the application asks for it.
How to check a part against its CAD model
According to the CNC Kitchen project description, as of November 11, 2026
- Load scanDrag the file into the window and select the unit
- Load CAD partOpen it in Deviation as a STEP or mesh file, then Align automatically
- Read the deviationView the color map, check values with the mouse pointer, use Find volume errors
- Save the resultCopy as text with Copy report
The buttons are labeled in English.
Source: GitHub, ScanRuler by CNC Kitchen
You copy results as text with Copy report. The interface is labeled in English.
What does the new curvature comb show?
The curvature comb is a checkbox under the edges in 2D Measure and under the sections in 3D Measure. It draws spikes on each edge whose length follows the curvature. With a true circular arc, all spikes are the same length. If they grow and shrink, the curve is not a circular arc. The application smooths scanned edges over 2 millimeters, adjustable. According to the release notes, the feature is off by default.
When recreating a handle or a bracket, this shows you whether you can draw the curve as an arc with a fixed radius or whether a free-form profile is needed.
How reliable are the measurements, and what does the AI agent bring?
On accuracy, the developer cites a test of their own: for a scan of a ball bar, the center distance matches GOM Inspect down to the last digit, 148.639 versus 148.64 millimeters. The test is a single measurement. According to the project description, nothing finer than about three times the scan noise is reliable.
Optionally, an AI agent controls the opened page, such as Claude Code, Codex, Claude Desktop or Cursor. As a prerequisite, the project description lists Node.js from version 22. With an agent, measurements, reports, images and file names leave your computer toward the model provider, unless the model runs locally. The agent can even build a STEP body from a scan. For a fan impeller, this took 106 minutes with 284 tool calls and can consume a large part of your usage quota.
The fan impeller was 96.3 percent within 0.3 millimeters of the scan, while the free-form shape of a scooter cover was only 68.9 percent within 0.4 millimeters. The figures compare the model with the scan, not with the real part.
What this means for you
Try ScanRuler first without an agent, using a scan you already have, and check, for example, whether a bore is really round. That way your files stay local.
Measure important dimensions yourself instead of relying solely on an agent's figures. And read the notes on data sharing before you run customer parts through an agent. What remains open is which scanners are suitable, since the project description is silent on this.
CNC Kitchen released version 0.11.2 on November 11, 2026.
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