# Zoodemic vs Zerko

The clearest difference is price: Zoodemic at Free against Zerko's $2.99. Zerko's advantage is update cadence (every 3 weeks vs every 5 months) and ratings volume (14 vs 2). On rating, ads, in-app purchases and device support there is nothing between them.

Zoodemic is free to download; Zerko costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Zoodemic against 4.9 for Zerko. That said, the two scores are not equally well evidenced: Zerko has 14 ratings behind it against 2, so its average is the more settled of the two.

Zoodemic ships an update every 5 months, Zerko every 3 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Zoodemic | Zerko |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zoodemic/id1537220619/reviews)** | [4.9 (14 ratings)](https://appshunter.io/ios/app/zerko/id6470181559/reviews) |
| Number of ratings | 2 | **14** |
| Positive reviews | — | 93.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Monetization | **Free** | Paid |
| Size | 77 MB | 100 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [University of Nebraska at Omaha College of Information Science and Technology](https://appshunter.io/developer/445659986) | [Maciej Targoni](https://appshunter.io/developer/495165602) |

## What reviewers say

### Zoodemic

[App page](https://appshunter.io/ios/app/zoodemic/id1537220619)

Engage in a "serious game" designed to teach students about preventing zoonotic diseases. Test your skills against virus waves and earn power-ups by answering educational questions. Content is sourced from reputable health organizations.

**Highlights:** Zoonotic disease education, Virus wave gameplay, Educational trivia for power-ups, Content from CDC and universities, Targeted at students

**In-app purchases:** none


### Zerko

[App page](https://appshunter.io/ios/app/zerko/id6470181559)

A relaxing puzzle game where you strategically place blocks to make all numbers on the board equal zero. Enjoy a no-pressure experience with calming audio and no in-app purchases or ads.

**Highlights:** Zero-sum number puzzles, Strategic block placement, Relaxing gameplay, No time pressure, No in-app purchases, No ads

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

**In-app purchases:** none


## Frequently asked questions

### Is Zoodemic free?

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

### Is Zerko free?

Zerko costs $2.99, with no in-app purchases.

### Which has better reviews, Zoodemic or Zerko?

Zoodemic is rated higher. Zoodemic averages 5.0 out of 5 from 2 ratings, while Zerko averages 4.9 from 14 ratings.

### Do Zoodemic or Zerko have ads?

Neither Zoodemic nor Zerko shows ads.

### Which is updated more often, Zoodemic or Zerko?

Zoodemic ships an update every 5 months, and Zerko every 3 weeks. Most recently, Zoodemic was updated on October 24, 2026 and Zerko on October 24, 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.*