# PhotoMetrix vs Codon One

The clearest difference is in-app purchases: PhotoMetrix at none against Codon One's 7. Codon One's advantage is review sentiment (76% vs 67%). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Codon One sells 7 one-off in-app purchases. PhotoMetrix asks for nothing beyond the download.

Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on October 11, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | PhotoMetrix | Codon One |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (25 ratings)](https://appshunter.io/ios/app/codon-one-biology-study/id1517313390/reviews)** |
| Number of ratings | — | **25** |
| Positive reviews | 66.7% of reviews | **76.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Monetization | **Free** | Free with in-app purchases |
| Size | 27 MB | 277 MB |
| Requires iOS | **15** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gilson Augusto Helfer](https://appshunter.io/developer/1131751264) | [Daniel Gebert](https://appshunter.io/developer/1517313389) |

## What reviewers say

### PhotoMetrix

[App page](https://appshunter.io/ios/app/photometrix/id1220976347)

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.

**Highlights:** 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

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Codon One

[App page](https://appshunter.io/ios/app/codon-one-biology-study/id1517313390)

Master molecular biology, genetics, evolution, and life chemistry through interactive modules and quizzes. Explore essential concepts with clear diagrams and concise explanations. Includes helpful tools for sequence analysis and genetic code reference.

**Highlights:** Interactive learning modules, Quick quizzes for comprehension, Clear diagrams and plain language, Molecule reference guide, Sequence analysis tools, Genetic code exploration

**Features:** Family Sharing, Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Module 2: Genetics | Free | one-time |
| Module 1: Chemistry of Life | Free | one-time |
| Module 3: Evolution | $2.99 | one-time |
| Module 4: Science History | $2.99 | one-time |
| Module 5: Cell Biology | $2.99 | one-time |
| Module 6: Development | $2.99 | one-time |
| Unlock All | $8.99 | one-time |


## Frequently asked questions

### Is PhotoMetrix free?

PhotoMetrix is free to download, with no in-app purchases.

### Is Codon One free?

Codon One is free to download, with in-app purchases available.

### Do PhotoMetrix or Codon One have ads?

Neither PhotoMetrix nor Codon One shows ads.

### Which is updated more often, PhotoMetrix or Codon One?

PhotoMetrix ships an update every 3 weeks, and Codon One every 3 weeks. Most recently, PhotoMetrix was updated on October 11, 2026 and Codon One on October 29, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*