Clinical-Grade Accuracy, Consumer-Ready Simplicity
Discover how the SnugFit O&P 3D Scanner delivers clinical-grade accuracy through two powerful 3D scan modules—FaceID sensor–based and rear camera–based scanning.
Dual Scan Modes. Unified Precision
The SnugFit O&P 3D Scanner app includes two scan modules to meet diverse needs across clinical and consumer settings:
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Front FaceID Sensor–Based 3D Scan: Leverages Apple’s TrueDepth camera for high-accuracy scanning.
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Rear Video Camera–Based 3D Scan: Enables 3D capture using just the standard iPad camera—no external hardware required.
Each module has been thoroughly tested to ensure it meets the accuracy requirements of orthotics, prosthetics, and custom-fit product applications.
FaceID Sensor-Based 3D Scan
To measure performance, we used a ground truth 3D model obtained with an industrial 3D scanner (accuracy up to 10 microns). Each target was scanned 10+ times to ensure repeatability. The SnugFit O&P scanner then scanned the same target, and results were compared by computing mean error, variance, and visual slice overlays.
Test Platforms: iPhone 12, iPad Pro 11” (2nd Gen)
Test Models: Anatomical foot model, Upper torso model
Results Summary:
Model Average Error Mean Variance
Foot Model < 0.4 mm < 0.4 mm
Torso Model < 0.5 mm < 0.7 mm
Rear Camera–Based 3D Scan Evaluation
A. Real Foot Repeatability Test
We scanned a real human foot 23 times using the SnugFit rear-camera scan module on a regular iPad (M4) (Note: All Apple devices have the same performance). Two physical markers were used to determine the ground truth foot length: 163.5 mm.
Test Results (in mm):
162.4, 164.2, 160.7, 161.1, 165.3, 163.8, 164.9, 163.8, 161.7, 163.8,
162.0, 164.2, 162.0, 163.3, 163.7, 162.8, 161.0, 163.4, 164.5, 165.6,
163.8, 164.5, 165.5
Mean Error: -0.3 mm
Standard Deviation: 1.7 mm
B. Foot Phantom 3D Overlay Test
We used an industrial 3D scanner to obtain high-accuracy (0.1 mm) foot phantom data, then overlaid it with the 3D data from the rear camera scan module.
Test Results:
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Mean Error: –0.15 mm
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Standard Deviation: 0.76 mm
This confirms that the rear camera–based scan module can deliver sub-millimeter accuracy for practical applications using only a regular iPad.
