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Bridging Accessibility and Precision: Evaluating the Reliability and Validity of a Smartphone-Based Skin Colorimeter.
Hongfei Ouyang1,2, Jungang Yang2,3, Xiaoli Ning2,4
1China-Japan Friendship Hospital (Institute of Clinical Medical Sciences), Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, People's Republic of China.
Clinical, Cosmetic and Investigational Dermatology
|April 6, 2026
Summary
A new smartphone app, You Look Good Today (YLGTD), shows excellent reliability and validity for measuring facial skin color. This accessible tool offers a cost-effective alternative to traditional methods for dermatologic research and clinical practice.
Area of Science:
- Dermatology and Medical Technology
- Biomedical Engineering
- Image Analysis
Background:
- Accurate skin color quantification is crucial in dermatology.
- Traditional methods are costly and require specialized equipment.
- Smartphone technology offers a promising, accessible alternative for skin assessment.
Purpose of the Study:
- To assess the reliability and validity of the You Look Good Today (YLGTD) smartphone application.
- To compare YLGTD's facial skin color measurements against established devices (VISIA and DermaLab Combo).
Main Methods:
- 105 Chinese participants with healthy facial skin were recruited.
- Facial cheek skin color was measured using YLGTD (user and physician modes), VISIA, and DermaLab Combo.
- Inter-rater reliability and criterion validity were analyzed using ICC, Bland-Altman analysis, and Pearson's correlation.
Main Results:
- YLGTD demonstrated excellent inter-rater reliability (ICC: 0.85-0.95).
- Small biases were observed between YLGTD measurement modes.
- YLGTD showed strong correlations with DermaLab Combo for L*, ITA°, and C* (r=0.71-0.81), especially in physician mode.
- Correlations with VISIA were comparable or weaker than YLGTD.
Conclusions:
- The YLGTD smartphone application is reliable and valid for facial skin color assessment.
- It particularly excels in evaluating pigmentation-related parameters.
- YLGTD provides a convenient, cost-effective, and consistent method for objective skin color analysis.
