# HZ.io vs Mathchool

The clearest difference is review sentiment: HZ.io at 62% against Mathchool's 0%. HZ.io also leads on update cadence (every 2 days vs every 3 months) and iOS requirement (10.0 vs 12.0). Mathchool's advantage is in-app purchases (none vs 10) and ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. HZ.io sells 10 one-off in-app purchases. Mathchool asks for nothing beyond the download.

HZ.io ships an update every 2 days, Mathchool every 3 months. The most recent releases landed on October 15, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | HZ.io | Mathchool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.2 (5 ratings)](https://appshunter.io/ios/app/hzio/id1500198865/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | **61.5% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 171 MB | 270 MB |
| Requires iOS | **10.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Gene Eu](https://appshunter.io/developer/1027026152) | [Woongjin Thinkbig Co., Ltd.](https://appshunter.io/developer/1614968450) |

## What reviewers say

### HZ.io

[App page](https://appshunter.io/ios/app/hzio/id1500198865)

Engage in a real-time online survival game where you either evade zombies as a survivor or hunt them as a zombie. Teams win by achieving their objectives within a 200-second time limit. Customize your character and communicate with others.

**Highlights:** Real-time online multiplayer, Survivor vs. Zombie gameplay, 200-second win conditions, Level up system, Custom skins and decorations, In-game chat

**Features:** Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zombie 5 Slot | $0.99 | one-time |
| Survivor 5 Slot | $0.99 | one-time |
| Zombie 10 Slot | $1.99 | one-time |
| Survivor 10 Slot | $1.99 | one-time |
| 50,000 Coin | $1.99 | one-time |
| Survivor 20 Slot | $2.99 | one-time |
| Zombie 20 Slot | $2.99 | one-time |
| Exp +50% | $3.99 | one-time |
| Coin +50% | $3.99 | one-time |
| Remove Ad | $5.99 | one-time |


### Mathchool

[App page](https://appshunter.io/ios/app/mathchool/id6448712301)

Engage in a real-time multiplayer hide-and-seek game set in a unique school populated by Dokkaebi. Solve math problems to collect items, help friends, and escape the tagger. It's a fun way to learn and play simultaneously.

**Highlights:** Real-time multiplayer hide-and-seek, Solve math problems for items, Character customization, AI-powered math problems, Cooperative gameplay

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HZ.io free?

HZ.io is free to download, with in-app purchases available.

### Is Mathchool free?

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

### Do HZ.io or Mathchool have ads?

HZ.io shows ads; Mathchool does not.

### Which is updated more often, HZ.io or Mathchool?

HZ.io ships an update every 2 days, and Mathchool every 3 months. Most recently, HZ.io was updated on October 15, 2026 and Mathchool on October 13, 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.*