# Zombie Directive vs Undersoil

The clearest difference is in-app purchases: Zombie Directive at none against Undersoil's 3. Zombie Directive also leads on ads (none vs shown) and iOS requirement (12.0 vs 15.1). Undersoil's advantage is update cadence (daily vs weekly). On price and device support there is nothing between them.

Both are free to download. Undersoil sells 3 one-off in-app purchases. Zombie Directive asks for nothing beyond the download.

Zombie Directive ships an update weekly, Undersoil daily. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Zombie Directive | Undersoil |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Weekly | **Daily** |
| Size | 60 MB | 70 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Chengdu Sanhao Nianhua Technology Co., Ltd](https://appshunter.io/developer/1576652891) | [Connor Burns](https://appshunter.io/developer/1893761320) |

## What reviewers say

### Zombie Directive

[App page](https://appshunter.io/ios/app/zombie-directive-7-day-siege/id6748058686)

**Features:** macOS Compatibility

**In-app purchases:** none


### Undersoil

[App page](https://appshunter.io/ios/app/undersoil/id6809608124)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Gem Pouch | $2.99 | one-time |
| Chest of Gems | $9.99 | one-time |
| Vault of Gems | $19.99 | one-time |


## Frequently asked questions

### Is Zombie Directive free?

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

### Is Undersoil free?

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

### Do Zombie Directive or Undersoil have ads?

Undersoil shows ads; Zombie Directive does not.

### Which is updated more often, Zombie Directive or Undersoil?

Zombie Directive ships an update weekly, and Undersoil daily. Most recently, Zombie Directive was updated on October 25, 2026 and Undersoil 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.*