All three 3D scanners tested by Texas Tech showed excellent reliability (ICC > 0.95), confirming research-grade accuracy across systems.
A 2024 study conducted by the Energy Balance & Body Composition Laboratory at Texas Tech University compared the reliability of three leading 3D body scanners: Fit3D ProScanner, Styku S100, and SizeStream SS20.
The purpose of the study was to measure how consistent body composition results (like body fat percentage) were when participants were scanned on two separate days — a test known as between-day reliability.
Key Findings
All three scanners demonstrated Excellent reliability, with Intraclass Correlation Coefficients (ICC) greater than 0.95 — a benchmark considered comparable to laboratory-grade instruments and medical devices.
| Scanner | ICC (Reliability Score) | Classification |
|---|---|---|
| Styku S100 | 0.997 | Outstanding |
| Fit3D ProScanner | 0.971 | Excellent |
| SizeStream SS20 | 0.992 | Outstanding |
These results confirm that Fit3D’s ProScanner achieved the same level of scientific reliability as its competitors, even in a controlled research environment.
How to Interpret These Results
While the Styku device reported a slightly higher ICC value, the differences between scanners were statistically minimal and not practically meaningful in real-world use.
In other words:
“All three scanners, including Fit3D, produced consistent results that meet research and medical-grade reliability standards.”
⚠️ A Note on Sample Size
This study included only 13 participants, which is considered a small sample size for statistical reporting. As such, the findings should be interpreted cautiously and not generalized to large populations. Larger-scale research would be needed to detect any real-world differences between devices.
Fit3D SNAP: The Next Generation
It’s important to note that this study was conducted on the Fit3D ProScanner, our previous-generation hardware system.
The new Fit3D SNAP uses the same validated core software engine but with next-generation AI, upgraded optics, and mobile hardware design — meaning it has moved beyond these metrics entirely.
SNAP delivers:
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Higher scan success rates
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Faster setup and calibration
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Improved body contour precision through advanced lens and AI modeling
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Zero hardware footprint with our Bring Your Own Device (BYOD) model
The Bottom Line
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The 2024 Texas Tech University study confirmed all three scanners — including Fit3D — had Excellent reliability (ICC > 0.95).
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These results place them on par with laboratory-grade instruments.
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The small sample size (13 people) limits broad conclusions.
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The study applied to the older Fit3D ProScanner, and the new Fit3D SNAP platform has surpassed these standards through modern AI and imaging advancements.
Citation:
DeHaven, B., Siedler, M., Stratton, M., Harty, P., Rodriguez, C., Keith, D., Green, J., Boykin, J., White, S., Williams, A., Dellinger, J., & Tinsley, G. (2024). Analyzing the Between-Day Reliability of Three-Dimensional Body Scanners for Body Composition Assessment. International Journal of Exercise Science: Conference Proceedings, Texas Tech University.