# Codon One vs PepRop

The clearest difference is update cadence: PepRop at every 5 days against Codon One's every 3 weeks. Codon One's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 18.2). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Codon One sells 7 one-off in-app purchases and PepRop sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Codon One ships an update every 3 weeks, PepRop every 5 days. The most recent releases landed on October 10, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Codon One | PepRop |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (24 ratings)](https://appshunter.io/ios/app/codon-one-biology-study/id1517313390/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 76.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 277 MB | 4 MB |
| Requires iOS | **15.6** | 18.2 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Gebert](https://appshunter.io/developer/1517313389) | [Yoshikazu Mikawa](https://appshunter.io/developer/1778069380) |

## 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 |


### PepRop

[App page](https://appshunter.io/ios/app/peprop/id6745401971)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Peptide Analyser | $3.99 | one-time |


## Frequently asked questions

### Is Codon One free?

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

### Is PepRop free?

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

### Do Codon One or PepRop have ads?

Neither Codon One nor PepRop shows ads.

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

Codon One ships an update every 3 weeks, and PepRop every 5 days. Most recently, Codon One was updated on October 10, 2026 and PepRop on October 14, 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.*