# Codon One vs Structural Formulas Study

The clearest difference is in-app purchases: Structural Formulas Study at none against Codon One's 7. Codon One's advantage is update cadence (every 3 weeks vs every 5 weeks) and iOS requirement (15.6 vs 18.4). On price, ads and device support there is nothing between them.

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

Codon One ships an update every 3 weeks, Structural Formulas Study every 5 weeks. The most recent releases landed on September 24, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Codon One | Structural Formulas Study |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (23 ratings)](https://appshunter.io/ios/app/codon-one-biology-study/id1517313390/reviews)** | — |
| Number of ratings | **23** | — |
| Positive reviews | 76.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 5 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 252 MB | 5 MB |
| Requires iOS | **15.6** | 18.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Gebert](https://appshunter.io/developer/1517313389) | [Jun Yamabe](https://appshunter.io/developer/1732682049) |

## What reviewers say

### 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 1: Chemistry of Life | Free | one-time |
| Module 2: Genetics | $2.99 | 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 |


### Structural Formulas Study

[App page](https://appshunter.io/ios/app/structural-formulas-study/id6752260162)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Codon One free?

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

### Is Structural Formulas Study free?

Structural Formulas Study is free to download, with no in-app purchases.

### Do Codon One or Structural Formulas Study have ads?

Neither Codon One nor Structural Formulas Study shows ads.

### Which is updated more often, Codon One or Structural Formulas Study?

Codon One ships an update every 3 weeks, and Structural Formulas Study every 5 weeks. Most recently, Codon One was updated on September 24, 2026 and Structural Formulas Study on September 20, 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.*