Comparison

Zoodemic vs Zerko

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Zoonotic disease education
  • Virus wave gameplay
  • Educational trivia for power-ups
  • Content from CDC and universities
  • Targeted at students
Read full description

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

About

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.

Highlights
  • Zero-sum number puzzles
  • Strategic block placement
  • Relaxing gameplay
  • No time pressure
  • No in-app purchases
  • No ads
Features
Read full description

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

Zoodemic4 screens
Zerko4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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

Scorecard5 real differences · 5 level
Zoodemic versus Zerko: the parameters behind the verdict, then further details
ParameterZoodemicZerko
PriceFree — better$2.99
Rating5.0 (2 ratings) — better4.9 (14 ratings)
Positive reviews—93.3% of reviews
Number of ratings214 — better
Update frequencyEvery 5 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.612.0 — better
Further details — not scored
Size77 MB100 MB
Age rating4+4+
DeveloperUniversity of Nebraska at Omaha College of Information Science and TechnologyMaciej Targoni

Customer experience

Zoodemic

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Zerko

All ratings14 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews15 reviews
Positive93.3%
Neutral6.7%
Negative0.0%

In-app purchases

None

Zoodemic

No in-app purchases

None

Zerko

No in-app purchases

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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