# OZO vs Metro Sort

The clearest difference is in-app purchases: Metro Sort at none against OZO's 10. Metro Sort also leads on update cadence (weekly vs fortnightly). OZO's advantage is iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. OZO sells 10 one-off in-app purchases. Metro Sort asks for nothing beyond the download.

OZO ships an update fortnightly, Metro Sort weekly. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | OZO | Metro Sort |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Fortnightly | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 432 MB | 226 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 17+ |
| Developer | [COCOBOO Games](https://appshunter.io/developer/1750013783) | [TLC STUDIOS PRIVATE LIMITED](https://appshunter.io/developer/1438772593) |

## What reviewers say

### OZO

[App page](https://appshunter.io/ios/app/ozo-ocean-zombie-outbreak/id6602891043)

Defend the ocean from a zombie invasion by assembling a team of diverse sea creatures. Strategize your defenses, unlock unique abilities, and upgrade your units through challenging missions and daily challenges.

**Highlights:** Diverse sea creature units with unique abilities, Challenging missions across various levels, High-quality underwater graphics and animations, Customizable upgrades for units, Daily challenges and rewards, Strategic defense gameplay

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Quick Boost | $0.99 | one-time |
| Piggy Bank | $0.99 | one-time |
| Remove Interrupted ads | $0.99 | one-time |
| Power Surge | $1.49 | one-time |
| Action Vault | $1.79 | one-time |
| Flash Forward | $1.79 | one-time |
| Turbo Deal | $2.09 | one-time |
| Infinity Bundle | $2.59 | one-time |
| VIP Membership | $4.99 | one-time |
| Mega Gem Pack | $12.99 | one-time |


### Metro Sort

[App page](https://appshunter.io/ios/app/metro-sort/id6748998833)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OZO free?

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

### Is Metro Sort free?

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

### Do OZO or Metro Sort have ads?

Both OZO and Metro Sort show ads.

### Which is updated more often, OZO or Metro Sort?

OZO ships an update fortnightly, and Metro Sort weekly. Most recently, OZO was updated on November 4, 2026 and Metro Sort on October 30, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*