Zoodemic vs Zerko
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Zoodemic
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.
- Zoonotic disease education
- Virus wave gameplay
- Educational trivia for power-ups
- Content from CDC and universities
- Targeted at students
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Zoodemic is a serious game for educating elementary, middle, and high school students about zoonotic disease prevention. A student can test their gaming skills by vanquishing multiple waves of viruses. Power-ups can be obtained by answering relevant educational questions related to basic hygiene, epidemiology, and zoonotic disease prevention Educational content in the game was sourced from the Centers for Disease Control and Prevention (https://www.cdc.gov/onehealth/in-action/influenza-and-zoonoses-education.html), Council of State and Territorial Epidemiologists (https://resources.cste.org/yia), the University of Nebraska Medical Center, and Iowa State University Center for Food Security & Public Health (https://content.cfsph.iastate.edu/YouthInAg/yinag-kids.php & https://content.cfsph.iastate.edu/YouthInAg/yinag-teen.php). While published by the University of Nebraska Omaha College of Information Science and Technology, this project is a partnership between University of Nebraska Omaha and University of Nebraska Medical Center. Icons created by Good Ware, Freepik, Pixel Buddha, Vecteezy, smalllikeart, Becris, Elzicon, hqrloveq, Vectors Market, Flat Icons from flaticon.com
Zerko
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.
- Zero-sum number puzzles
- Strategic block placement
- Relaxing gameplay
- No time pressure
- No in-app purchases
- No ads
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Some call it reverse sudoku, while others call it a nullification game, but it's Zerko - a puzzle game filled with shapes, numbers, and a straightforward goal: make every number zero. To achieve this, you need to strategically place blocks of various shapes and values so that the numbers on the board effectively "remove up" to zero. Like all my games, this one too is about relaxation... Just chill. There are no points, no time pressure, no data collection, no in-app purchases, no ads, no nonsense ;) My only hope is that you'll enjoy it and that I'll be able to add new content and levels for you in the future. Relaxing audio by: Marek Koszczyński
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Zoodemic | Zerko |
|---|---|---|
| Price | Free — better | $2.99 |
| Rating | 5.0 (2 ratings) — better | 4.9 (14 ratings) |
| Positive reviews | — | 93.3% of reviews |
| Number of ratings | 2 | 14 — better |
| Update frequency | Every 5 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 77 MB | 100 MB |
| Age rating | 4+ | 4+ |
| Developer | University of Nebraska at Omaha College of Information Science and Technology | Maciej Targoni |
Customer experience
Zoodemic
Zerko
In-app purchases
Zoodemic
No in-app purchases
Zerko
No in-app purchases









