# Physiology Solution vs Codon One

The clearest difference is rating: Codon One at 4.5 against Physiology Solution's 3.8. Codon One also leads on update cadence (every 3 weeks vs every 7 months) and review sentiment (76% vs 67%). Physiology Solution's advantage is in-app purchases (none vs 7) and iOS requirement (11.0 vs 15.6). 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. Physiology Solution asks for nothing beyond the download.

Codon One holds the better App Store score, 4.5 against 3.8. Both are backed by a comparable volume of ratings — 5 and 24 respectively. Written reviews point the same way: 67% of Physiology Solution's written reviews are positive against 76% of Codon One's.

Physiology Solution ships an update every 7 months, Codon One every 3 weeks. The most recent releases landed on September 24, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Physiology Solution | Codon One |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.8 (5 ratings)](https://appshunter.io/ios/app/physiology-solution/id1455306712/reviews) | **[4.5 (24 ratings)](https://appshunter.io/ios/app/codon-one-biology-study/id1517313390/reviews)** |
| Number of ratings | 5 | **24** |
| Positive reviews | 66.7% of reviews | **76.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 3 MB | 277 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Quantum Quasar Infoworld LLP](https://appshunter.io/developer/1095005974) | [Daniel Gebert](https://appshunter.io/developer/1517313389) |

## What reviewers say

### Physiology Solution

[App page](https://appshunter.io/ios/app/physiology-solution/id1455306712)

Explore comprehensive information on human physiology, drawing from established medical texts. This educational tool provides key concepts and figures for learning purposes.

**Highlights:** Human physiology content, Based on Guyton and Ganong, Educational figures and text, Comprehensive information

**Features:** macOS Compatibility

**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 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 Physiology Solution free?

Physiology Solution 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, Physiology Solution or Codon One?

Codon One is rated higher. Physiology Solution averages 3.8 out of 5 from 5 ratings, while Codon One averages 4.5 from 24 ratings.

### Do Physiology Solution or Codon One have ads?

Neither Physiology Solution nor Codon One shows ads.

### Which is updated more often, Physiology Solution or Codon One?

Physiology Solution ships an update every 7 months, and Codon One every 3 weeks. Most recently, Physiology Solution was updated on September 24, 2026 and Codon One on October 10, 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.*