# CellAtlas vs Codon One

The clearest difference is rating: Codon One at 4.5 against CellAtlas's 3.2. Codon One also leads on update cadence (every 3 weeks vs every 2 months). CellAtlas's advantage is in-app purchases (none vs 7). On price, review sentiment, ratings volume and ads there is nothing between them.

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

Codon One holds the better App Store score, 4.5 against 3.2. Both are backed by a comparable volume of ratings — 22 and 24 respectively. Written reviews complicate that: 84% of CellAtlas's written reviews are positive against 76% of Codon One's, so the app with the better star average is not the one people write more warmly about.

CellAtlas ships an update every 2 months, Codon One every 3 weeks. The most recent releases landed on October 19, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | CellAtlas | Codon One |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.2 (22 ratings)](https://appshunter.io/ios/app/cellatlas/id413226907/reviews) | **[4.5 (24 ratings)](https://appshunter.io/ios/app/codon-one-biology-study/id1517313390/reviews)** |
| Number of ratings | 22 | **24** |
| Positive reviews | **84.3% of reviews** | 76.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 106 MB | 277 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CellaVision](https://appshunter.io/developer/1185675201) | [Daniel Gebert](https://appshunter.io/developer/1517313389) |

## What reviewers say

### CellAtlas

[App page](https://appshunter.io/ios/app/cellatlas/id413226907)

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.

**Highlights:** Blood cell morphology guide, Expert-written mini lectures, Extensive cell image database, CellQuiz game, Knowledge testing

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 👍 Great for learning morphology
- 👍 Helpful study tool
- 👍 Fun quiz format
- 👍 Easy to navigate
- 👍 Good for review

**What reviewers complain about**

- ⏰ Ridiculous timer
- ⏰ Too little time
- ⏰ Timer causes mistakes
- ⏰ Timer prevents practice
- 🐛 Quiz is broken/rigged

**Reported bugs**

- 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

**Requested features**

- Remove timer option
- Untimed mode
- More time for quizzes
- Quizzes for specific cells/sections
- More images/examples


### 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 |


## Frequently asked questions

### Is CellAtlas free?

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

### Is Codon One free?

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

### Which has better reviews, CellAtlas or Codon One?

Codon One is rated higher. CellAtlas averages 3.2 out of 5 from 22 ratings, while Codon One averages 4.5 from 24 ratings.

### Do CellAtlas or Codon One have ads?

Neither CellAtlas nor Codon One shows ads.

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

CellAtlas ships an update every 2 months, and Codon One every 3 weeks. Most recently, CellAtlas was updated on October 19, 2026 and Codon One on October 10, 2026.

---

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