CellAtlas vs PhotoMetrix
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CellAtlas
Explore blood cell morphology with expert-written lectures and a vast image database. Test your knowledge with an engaging quiz game designed for efficient learning.
- Blood cell morphology guide
- Expert-written mini lectures
- Extensive cell image database
- CellQuiz game
- Knowledge testing
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Welcome to the CellAtlas Application - your guide to blood cell morphology. CellAtlas contains mini lectures written by hematology experts complemented by an extensive cell image database. The App also includes a game, CellQuiz. A fun and efficient way to test your knowledge in cell morphology. CellAtlas is a product from the medical technology company CellaVision.
PhotoMetrix
This application performs univariate and multivariate data analysis using image acquisition and RGB histograms. It supports various color systems and can export data and charts via email for validation with other software.
- 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
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This app employs Single Linear Correlation technics for univariate analysis and Principal Component Analysis (PCA) for multivariate exploratory analysis, including Partial Least Square Regression (PLS). 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
Screenshots
Verdict
The clearest difference is review sentiment: CellAtlas at 84% against PhotoMetrix's 67%. PhotoMetrix's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads, in-app purchases and monetization model there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
CellAtlas ships an update every 2 months, PhotoMetrix every 3 weeks. The most recent releases landed on October 23, 2026 and October 11, 2026 respectively.
| Parameter | CellAtlas | PhotoMetrix |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (22 ratings) — better | — |
| Positive reviews | 84.3% of reviews — better | 66.7% of reviews |
| Number of ratings | 22 — better | — |
| Update frequency | Every 2 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15 |
| Further details — not scored | ||
| Size | 106 MB | 27 MB |
| Age rating | 4+ | 4+ |
| Developer | CellaVision | Gilson Augusto Helfer |
Customer experience
CellAtlas
PhotoMetrix
Bugs and requests
CellAtlas
Reported bugs
6 issues- Timer is too short
- Quiz moves too slowly after correct answer
- Duplicate images that only one counts
- App not opening on some devices
- Missing WBCs
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- Layout issues on older iPhones
Requested features
22 requests- Remove timer option
- Untimed mode
- More time for quizzes
- Quizzes for specific cells/sections
- More images/examples
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- Larger database of cells
- More examples of atypical/abnormal cells
- Ability to practice specific cell types
- Option to quiz on specific cell types
- More options for tests (e.g., malignancies)
- Ability to practice maturation stages
- Zoomable slides
- Labels for cell structures
- Side-by-side cell comparison
- Save quiz results
- Add body fluid images
- Add coag cascade
- Add disease states/inclusions
- Link to LIS system
- More photos
- Updates for more cell pictures
- Support for older iPhone screens
PhotoMetrix
Not enough reviews yet to summarise bugs or requests.
In-app purchases
CellAtlas
No in-app purchases
PhotoMetrix
No in-app purchases
Questions
Is CellAtlas free?
Is PhotoMetrix free?
Do CellAtlas or PhotoMetrix have ads?
Which is updated more often, CellAtlas or PhotoMetrix?
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