# Codon One vs Day Genius

The clearest difference is rating: Day Genius at 5.0 against Codon One's 4.5. Day Genius also leads on review sentiment (100% vs 76%). Codon One's advantage is ratings volume (25 vs 1) and iOS requirement (15.6 vs 26.0). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Codon One sells 7 one-off in-app purchases and Day Genius sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Day Genius holds the better App Store score, 5.0 against 4.5. 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: 76% of Codon One's written reviews are positive against 100% of Day Genius's.

Codon One ships an update every 3 weeks, Day Genius every 2 weeks. The most recent releases landed on October 29, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Codon One | Day Genius |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (25 ratings)](https://appshunter.io/ios/app/codon-one-biology-study/id1517313390/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/day-genius/id6801888644/reviews)** |
| Number of ratings | **25** | 1 |
| Positive reviews | 76.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 277 MB | 6 MB |
| Requires iOS | **15.6** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Gebert](https://appshunter.io/developer/1517313389) | [Craig Ricks](https://appshunter.io/developer/6801888646) |

## 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 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 |


### Day Genius

[App page](https://appshunter.io/ios/app/day-genius/id6801888644)

Learn to calculate the weekday for any date without a calendar or phone. This app teaches a step-by-step method with interactive drills and games to master the skill. Unlock advanced features with a one-time purchase.

**Highlights:** Step-by-step weekday calculation method, Interactive drills and flashcards, Two engaging practice games, Progress tracking and weak-spot identification, Reference tables for calculations, Support for historical calendar rules

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Method | $3.99 | one-time |


## Frequently asked questions

### Is Codon One free?

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

### Is Day Genius free?

Day Genius is free to download, with in-app purchases available.

### Which has better reviews, Codon One or Day Genius?

Day Genius is rated higher. Codon One averages 4.5 out of 5 from 25 ratings, while Day Genius averages 5.0 from 1 ratings.

### Do Codon One or Day Genius have ads?

Neither Codon One nor Day Genius shows ads.

### Which is updated more often, Codon One or Day Genius?

Codon One ships an update every 3 weeks, and Day Genius every 2 weeks. Most recently, Codon One was updated on October 29, 2026 and Day Genius on October 14, 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.*