# Zen Egg vs Rail Defence

The clearest difference is in-app purchases: Zen Egg at none against Rail Defence's 18. Rail Defence's advantage is update cadence (fortnightly vs every 2 months) and iOS requirement (13.0 vs 18.6). On price, ads and device support there is nothing between them.

Both are free to download. Rail Defence sells 18 one-off in-app purchases. Zen Egg asks for nothing beyond the download.

Zen Egg ships an update every 2 months, Rail Defence fortnightly. The most recent releases landed on October 26, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Zen Egg | Rail Defence |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.1 (1.1K ratings)](https://appshunter.io/ios/app/rail-defence/id6739333810/reviews)** |
| Number of ratings | — | **1.1K** |
| Positive reviews | — | 1.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Fortnightly** |
| Monetization | — | Free with in-app purchases |
| Size | 41 MB | 156 MB |
| Requires iOS | 18.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Animist OU](https://appshunter.io/developer/1079582571) | [Upperpik Oyun Yazilim ve Pazarlama Ticaret Anonim Sirketi](https://appshunter.io/developer/1225221447) |

## What reviewers say

### Zen Egg

[App page](https://appshunter.io/ios/app/zen-egg/id1080345271)

**In-app purchases:** none


### Rail Defence

[App page](https://appshunter.io/ios/app/rail-defence/id6739333810)

Defend your castle from waves of enemies by strategically placing and upgrading weapons on a circular railway. Utilize special powers and enhanced armaments to repel increasingly formidable foes and protect your stronghold.

**Highlights:** Circular railway defense, Acquire new weapons, Upgrade weapons, Strengthen defenses, Special powers

**Features:** macOS Compatibility

**In-app purchases (18)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cash kickstart pack | $1.99 | one-time |
| 10 Tickets | $1.99 | one-time |
| Manager | $2.99 | one-time |
| Money Fountain Pack | $2.99 | one-time |
| Engineer | $2.99 | one-time |
| 20 Tickets | $2.99 | one-time |
| Big Deal Pack | $3.99 | one-time |
| Financier | $3.99 | one-time |
| Royal Treasury Pack | $4.99 | one-time |
| 50 Tickets | $4.99 | one-time |
| No Ads | $4.99 | one-time |
| Bundle | $5.99 | one-time |
| Treasury Trove Pack | $5.99 | one-time |
| 30 Tickets and No Ads | $5.99 | one-time |
| Mega Bundle | $7.99 | one-time |
| Big Vault Pack | $8.99 | one-time |
| Ultra Bundle | $10.99 | one-time |
| Big Chest Treasure | $11.99 | one-time |

**What reviewers like**

- 🚀 Hack

**What reviewers complain about**

- 🐛 Glitches
- 💸 Obscene amount of Ads
- 💸 Advertisement Simulator
- 💸 Ads Ads & more Ads
- 💸 Ads

**Reported bugs**

- The bomb does not work after a few seconds
- Randomly the weapons won't work
- The crossbow stops working after a while

**Requested features**

- More levels
- Different zombies
- More upgrades


## Frequently asked questions

### Is Zen Egg free?

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

### Is Rail Defence free?

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

### Do Zen Egg or Rail Defence have ads?

Both Zen Egg and Rail Defence show ads.

### Which is updated more often, Zen Egg or Rail Defence?

Zen Egg ships an update every 2 months, and Rail Defence fortnightly. Most recently, Zen Egg was updated on October 26, 2026 and Rail Defence on October 28, 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.*