# PhotoMetrix > Image-based statistical analysis tool for univariate and multivariate data. (iPhone/iPad app by Gilson Augusto Helfer.) - Source: https://appshunter.io/ios/app/photometrix/id1220976347 (this page in markdown: same URL + `.md`) - Developer: [Gilson Augusto Helfer](https://appshunter.io/developer/1131751264) - Category: Education, Utilities - Price: Free - Age rating: 4+ - Requires: iOS 13.0 · 27 MB - Languages: American English - Released: 2017-03-30 - Data updated: 2026-07-18 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/photometrix/id1220976347/reviews.md ## What is PhotoMetrix? This app employs Single Linear Correlation technics for univariate analysis and Principal Component Analysis (PCA) for multivariate exploratory analysis, including Partial Least Square Regression. The image data are acquired using the device main camera and photo album, both converted in RGB histograms. In addition, apart color channels of RGB, HSV, HSL and HSI systems are used during the univariate and multivariate processes. It is possible to send by e-mail the image data, analysis data and charts. In order to validate the obtained results, the same sets of data were tested using Microsoft Excel© and ChemoStat©. The results in both applications coincided in various combinations. This app calculates and plot: eigenvalues, eigenvectors, scores, loadings using Singular Value Decomposition in Multivariate Analysis. This app calculates and plot: slope (span), intercept (off-set) and regression (Pearson product-moment correlation coefficient) in Univariate Calibration Analysis. http://dx.doi.org/10.5935/0103-5053.20160182 ## Key features - Univariate analysis with Single Linear Correlation - Multivariate analysis with Principal Component Analysis (PCA) - Image data acquisition via device camera - RGB histogram conversion - Support for RGB, HSV, HSL, and HSI color systems - Email export of data, analysis, and charts - Calculation of eigenvalues, eigenvectors, scores, and loadings ## Recent user reviews (3 of 3) All indexed reviews: https://appshunter.io/ios/app/photometrix/id1220976347/reviews.md ### 1/5 — Não funcionou comigo *2020-03-27, version 1.8* Não funcionou no meu celular. Depois que faço a captura das imagens para gerar a curva e clico em salvar o programa fecha sozinho e não mostrar a equação da reta. ### 5/5 — PCA only *2018-08-10, version 1.6* Great! ### 5/5 — Ótimo *2018-08-10, version 1.6* Excelente aplicativo! Além de gratuito é fácil de utilizar. Fiz análise multivariada e obtive bons resultados. ## Frequently asked questions about PhotoMetrix ### What statistical methods does PhotoMetrix use? PhotoMetrix employs Single Linear Correlation for univariate analysis and Principal Component Analysis (PCA) for multivariate exploratory analysis. It calculates and plots eigenvalues, eigenvectors, scores, and loadings using Singular Value Decomposition in multivariate analysis. ### How does PhotoMetrix acquire data? Image data is acquired using the device's main camera and converted into RGB histograms. The analysis also utilizes color channels from HSV, HSL, and HSI systems. ### Can I share my analysis results from PhotoMetrix? Yes, you can send image data, analysis data, and charts via email. This allows for easy sharing and validation with other software like Microsoft Excel or ChemoStat. ### What are the specific calculations performed by PhotoMetrix? In multivariate analysis, it calculates and plots eigenvalues, eigenvectors, scores, and loadings. For univariate calibration analysis, it calculates and plots slope, intercept, and regression (Pearson product-moment correlation coefficient). ### What is the age rating for PhotoMetrix? PhotoMetrix has an age rating of 4+, making it suitable for a wide range of users. ### On which devices can I use PhotoMetrix? PhotoMetrix is supported on iPhone and iPod devices. ### How often is PhotoMetrix updated? The app was last updated on September 15, 2018, with version 1.8. It was initially released on March 30, 2017. ### Does PhotoMetrix have ads? No, PhotoMetrix does not contain advertisements. ## Version history (last 5 releases) ### 2.1 — 2026-07-17 fix camera settings ### 2.0 — 2026-07-09 new features as PLS and HCA ### 1.8 — 2018-09-15 iOS X layout adjust ### 1.7 — 2018-09-12 New features: calculates and plot slope (span), intercept (off-set) and regression (Pearson product-moment correlation coefficient) in Univariate Calibration Analysis. ### 1.6 — 2017-06-29 bug fix on low number of samples ## Apps similar to PhotoMetrix | App | Rating | Price | Category | | --- | --- | --- | --- | | [Statistics Calculator - Basics](https://appshunter.io/ios/app/statistics-calculator-basics/id6472452972) | — | Free | Education | | [Hypothesis Test - Type I PRO](https://appshunter.io/ios/app/hypothesis-test-type-i-pro/id6472454829) | — | $1.99 | Education | | [Galileo Data Entry](https://appshunter.io/ios/app/galileo-data-entry/id1065346078) | — | $0.99 | Education | | [Sci-Lab Primary](https://appshunter.io/ios/app/sci-lab-primary/id1387072836) | — | Free | Education | | [Classroom Environment](https://appshunter.io/ios/app/classroom-environment/id1475610909) | — | Free | Education | | [iLab V12](https://appshunter.io/ios/app/ilab-v12/id1632380082) | — | Free | Education | ## More apps by Gilson Augusto Helfer - [Radios RS](https://appshunter.io/ios/app/radios-rs/id1131751265) - [Radios BR](https://appshunter.io/ios/app/radios-br/id1133661965) - [Defluoridation](https://appshunter.io/ios/app/defluoridation/id1153100622) - [TvIpBrasil](https://appshunter.io/ios/app/tvipbrasil/id1186884138) - [ArtUniformes](https://appshunter.io/ios/app/artuniformes/id1188148463) All apps by Gilson Augusto Helfer: https://appshunter.io/developer/1131751264 ## Related topics [kemper profiler](https://appshunter.io/ios/topics/kemper-profiler) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-18.*