# Decodoku vs Eterna

The clearest difference is review sentiment: Decodoku at 100% against Eterna's 33%. Decodoku also leads on rating (5.0 vs 3.7) and iOS requirement (8.0 vs 13.0). Eterna's advantage is update cadence (every 3 weeks vs every 3 months) and ratings volume (15 vs 3). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Decodoku holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: Eterna has 15 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 100% of Decodoku's written reviews are positive against 33% of Eterna's.

Decodoku ships an update every 3 months, Eterna every 3 weeks. The most recent releases landed on September 26, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Decodoku | Eterna |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/decodoku/id1093080064/reviews)** | [3.7 (15 ratings)](https://appshunter.io/ios/app/eterna/id1513216417/reviews) |
| Number of ratings | 3 | **15** |
| Positive reviews | **100.0% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 52 MB | 188 MB |
| Requires iOS | **8.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [James Robin Wootton](https://appshunter.io/developer/1093080063) | [Vital Mind Media](https://appshunter.io/developer/1513216416) |

## What reviewers say

### Decodoku

[App page](https://appshunter.io/ios/app/decodoku/id1093080064)

Engage in a unique puzzle game that doubles as a tool for scientific research in quantum error correction. Solve complex challenges to help advance the development of real-life quantum computers. Explore the science behind the game on the developer's website.

**Highlights:** Quantum puzzle gameplay, Scientific research tool, Quantum error correction, Advance quantum computing, Educational science content

**In-app purchases:** none


### Eterna

[App page](https://appshunter.io/ios/app/eterna/id1513216417)

Engage in a citizen science game to design RNA molecules for medical research. Solve puzzles to unlock lab access and contribute to inventing new medicines through challenges.

**Highlights:** Design RNA molecules, Solve scientific puzzles, Participate in medical research, Invent new medicines, Unlock lab access

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

**In-app purchases:** none


## Frequently asked questions

### Is Decodoku free?

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

### Is Eterna free?

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

### Which has better reviews, Decodoku or Eterna?

Decodoku is rated higher. Decodoku averages 5.0 out of 5 from 3 ratings, while Eterna averages 3.7 from 15 ratings.

### Do Decodoku or Eterna have ads?

Neither Decodoku nor Eterna shows ads.

### Which is updated more often, Decodoku or Eterna?

Decodoku ships an update every 3 months, and Eterna every 3 weeks. Most recently, Decodoku was updated on September 26, 2026 and Eterna on September 17, 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.*