# Protozoan Identification vs Codon One

The clearest difference is review sentiment: Codon One at 76% against Protozoan Identification's 0%. Codon One also leads on rating (4.5 vs 2.0) and update cadence (every 3 weeks vs every 15 months). Protozoan Identification's advantage is in-app purchases (none vs 7) and iOS requirement (13.0 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. Protozoan Identification asks for nothing beyond the download.

Codon One holds the better App Store score, 4.5 against 2.0. That said, the two scores are not equally well evidenced: Codon One has 25 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 0% of Protozoan Identification's written reviews are positive against 76% of Codon One's.

Protozoan Identification ships an update every 15 months, Codon One every 3 weeks. Both last shipped on October 29, 2026.

## The numbers

| Metric | Protozoan Identification | Codon One |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.0 (1 ratings)](https://appshunter.io/ios/app/protozoan-identification/id506715288/reviews) | **[4.5 (25 ratings)](https://appshunter.io/ios/app/codon-one-biology-study/id1517313390/reviews)** |
| Number of ratings | 1 | **25** |
| Positive reviews | 0.0% of reviews | **76.5% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 3 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 221 MB | 277 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carolina Biological Supply](https://appshunter.io/developer/413708533) | [Daniel Gebert](https://appshunter.io/developer/1517313389) |

## What reviewers say

### Protozoan Identification

[App page](https://appshunter.io/ios/app/protozoan-identification/id506715288)

Explore a collection of protozoan images and videos. Features an interactive key, labeling activities, and practice exercises to aid in identification and study.

**Highlights:** Interactive dichotomous key, Labeling activities, Protozoan images and videos, Practice exercises, Study aids

**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 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 Protozoan Identification free?

Protozoan Identification 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, Protozoan Identification or Codon One?

Codon One is rated higher. Protozoan Identification averages 2.0 out of 5 from 1 ratings, while Codon One averages 4.5 from 25 ratings.

### Do Protozoan Identification or Codon One have ads?

Neither Protozoan Identification nor Codon One shows ads.

### Which is updated more often, Protozoan Identification or Codon One?

Protozoan Identification ships an update every 15 months, and Codon One every 3 weeks. Most recently, Protozoan Identification was updated on October 29, 2026 and Codon One on October 29, 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.*