# Chemical Structures Quiz vs Codon One

The clearest difference is price: Codon One at Free against Chemical Structures Quiz's $3.99. Codon One also leads on update cadence (every 3 weeks vs every 2 months) and review sentiment (76% vs 67%). Chemical Structures Quiz's advantage is in-app purchases (none vs 7) and iOS requirement (11.0 vs 15.6). On ads and device support there is nothing between them.

Codon One is free to download; Chemical Structures Quiz costs $3.99 up front. Codon One sells 7 one-off in-app purchases. Chemical Structures Quiz asks for nothing beyond the download.

Chemical Structures Quiz ships an update every 2 months, Codon One every 3 weeks. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Chemical Structures Quiz | Codon One |
| --- | --- | --- |
| Price | $3.99 | **Free** |
| Rating | — | **[4.5 (25 ratings)](https://appshunter.io/ios/app/codon-one-biology-study/id1517313390/reviews)** |
| Number of ratings | — | **25** |
| Positive reviews | 66.7% of reviews | **76.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 12 MB | 277 MB |
| Requires iOS | **11.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Marijn Dillen](https://appshunter.io/developer/1276712320) | [Daniel Gebert](https://appshunter.io/developer/1517313389) |

## What reviewers say

### Chemical Structures Quiz

[App page](https://appshunter.io/ios/app/chemical-structures-quiz/id1397168183)

Test your knowledge of organic and biochemical compounds with multiple-choice quizzes. Learn systematic and common names for hydrocarbons, functional groups, and biomolecules. Ideal for high school students studying chemistry.

**Highlights:** Multiple-choice quizzes, Learn systematic and common names, Covers hydrocarbons, functional groups, biomolecules, Offline functionality, No advertisements

**Features:** macOS Compatibility, Vision Pro support

**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 2: Genetics | Free | one-time |
| Module 1: Chemistry of Life | Free | 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 Chemical Structures Quiz free?

Chemical Structures Quiz costs $3.99, with no in-app purchases.

### Is Codon One free?

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

### Do Chemical Structures Quiz or Codon One have ads?

Neither Chemical Structures Quiz nor Codon One shows ads.

### Which is updated more often, Chemical Structures Quiz or Codon One?

Chemical Structures Quiz ships an update every 2 months, and Codon One every 3 weeks. Most recently, Chemical Structures Quiz was updated on November 2, 2026 and Codon One on November 3, 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.*