Compares two E57 files structurally rather than byte for byte, and reports what actually changed: scan count, pose, point format, coordinate bounds and per-scan metadata. Built for verifying that an export pipeline did not quietly rewrite a survey.

• Reads 40M points in 8s on a laptop
• Reports pose drift below 1mm
• Single binary, no Python environment to manage
• HTML report you can send to a client