# Cat Run! vs Purify the World

The clearest difference is in-app purchases: Cat Run! at none against Purify the World's 7. Cat Run! also leads on update cadence (every 2 days vs every 6 weeks). Purify the World's advantage is review sentiment (25% vs 11%). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Purify the World sells 7 one-off in-app purchases. Cat Run! asks for nothing beyond the download.

Cat Run! ships an update every 2 days, Purify the World every 6 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | Cat Run! | Purify the World |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/purify-the-world/id6739110940/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 11.1% of reviews | **25.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 2 days** | Every 6 weeks |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 100 MB | 291 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [Risa Sasaki](https://appshunter.io/developer/1215156158) | [Eureka Studio Inc.](https://appshunter.io/developer/1418633832) |

## What reviewers say

### Cat Run!

[App page](https://appshunter.io/ios/app/cat-run/id6504513800)

Guide a cute cat back to its family by tapping to jump. Master three-stage jumps to clear all levels. Enjoy a simple yet challenging game experience.

**Highlights:** Tap to jump, Three-stage jump mechanic, Clear all stages, Cute cat character, Simple controls

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

**In-app purchases:** none

**What reviewers like**

- 🏆 High sense of accomplishment upon completion
- 💡 Provides tips for difficult stages (e.g., 5-2)
- 👍 Simple controls
- 😊 Can be addictive and fun for some
- ⏱️ Short ads are acceptable for some users

**What reviewers complain about**

- ❌ Extremely difficult stages (especially 5-2)
- ❌ Frequent and intrusive advertisements
- ❌ Lack of in-game explanations or tutorials
- ❌ Unfair or inaccurate hit detection/collision
- ❌ Game crashes frequently

**Reported bugs**

- App crashes frequently
- Ads appear during gameplay and block controls
- Inaccurate hit detection (hit when not touched, not hit when touched)
- Game over on seemingly safe actions
- Ads that redirect to other apps unexpectedly

**Requested features**

- Reduce the number of advertisements
- Provide in-game tutorials or explanations
- Lower the difficulty of certain stages
- Improve hit detection and collision accuracy
- Fix game crashes


### Purify the World

[App page](https://appshunter.io/ios/app/purify-the-world/id6739110940)

Survive a zombie-infested world by collecting DNA, developing a vaccine, and collaborating with other survivors. Your mission is to cleanse the contaminated land and rebuild society.

**Highlights:** Zombie DNA collection and study, Vaccine creation and deployment, Contaminated surface purification, Cooperative survival gameplay, Post-apocalyptic world exploration

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Handful of Tickets | $1.99 | one-time |
| World Pack 1 | $2.99 | one-time |
| Remove Ads | $3.99 | one-time |
| Bundle of Tickets | $4.99 | one-time |
| World Pack 1 - Before Discount | $9.99 | one-time |
| Stack of Tickets | $14.99 | one-time |
| Mountain of Tickets | $49.99 | one-time |


## Frequently asked questions

### Is Cat Run! free?

Cat Run! is free to download, with no in-app purchases.

### Is Purify the World free?

Purify the World is free to download, with in-app purchases available.

### Do Cat Run! or Purify the World have ads?

Both Cat Run! and Purify the World show ads.

### Which is updated more often, Cat Run! or Purify the World?

Cat Run! ships an update every 2 days, and Purify the World every 6 weeks. Most recently, Cat Run! was updated on October 24, 2026 and Purify the World 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.*