# Codon One vs HistoGrams⁺

The clearest difference is in-app purchases: HistoGrams⁺ at none against Codon One's 7. HistoGrams⁺ also leads on rating (4.7 vs 4.4) and iOS requirement (12.0 vs 15.6). Codon One's advantage is update cadence (every 3 weeks vs every 2 months) and ratings volume (23 vs 3). 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. HistoGrams⁺ asks for nothing beyond the download.

HistoGrams⁺ holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Codon One has 23 ratings behind it against 3, so its average is the more settled of the two. Written reviews complicate that: 76% of Codon One's written reviews are positive against 67% of HistoGrams⁺'s, so the app with the better star average is not the one people write more warmly about.

Codon One ships an update every 3 weeks, HistoGrams⁺ every 2 months. The most recent releases landed on September 8, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Codon One | HistoGrams⁺ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (23 ratings)](https://appshunter.io/ios/app/codon-one-biology-study/id1517313390/reviews) | **[4.7 (3 ratings)](https://appshunter.io/ios/app/histograms/id6477970674/reviews)** |
| Number of ratings | **23** | 3 |
| Positive reviews | **76.5% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 252 MB | 28 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Daniel Gebert](https://appshunter.io/developer/1517313389) | [Viren Kariya](https://appshunter.io/developer/1731249462) |

## 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 |


### HistoGrams⁺

[App page](https://appshunter.io/ios/app/histograms/id6477970674)

This app offers a quick reference and revision guide for students, covering histology, physiology, biochemistry, and pathology. It features comprehensive notes and hand-drawn diagrams to simplify complex topics and prepare for exams.

**Highlights:** Histology revision notes, Hand-drawn diagrams, Neuroanatomy demos, Physiology practical details, Video links for concepts, Regular updates

**In-app purchases:** none


## Frequently asked questions

### Is Codon One free?

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

### Is HistoGrams⁺ free?

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

### Which has better reviews, Codon One or HistoGrams⁺?

HistoGrams⁺ is rated higher. Codon One averages 4.4 out of 5 from 23 ratings, while HistoGrams⁺ averages 4.7 from 3 ratings.

### Do Codon One or HistoGrams⁺ have ads?

Neither Codon One nor HistoGrams⁺ shows ads.

### Which is updated more often, Codon One or HistoGrams⁺?

Codon One ships an update every 3 weeks, and HistoGrams⁺ every 2 months. Most recently, Codon One was updated on September 8, 2026 and HistoGrams⁺ on September 11, 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.*