# Blue Defense! vs Evil Ducks Castle

The clearest difference is update cadence: Blue Defense! at every 4 months against Evil Ducks Castle's every 37 months. Evil Ducks Castle's advantage is iOS requirement (12.2 vs 16.0). On price, ads, in-app purchases and device support there is nothing between them.

Blue Defense! costs $0.99 and Evil Ducks Castle $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Blue Defense! ships an update every 4 months, Evil Ducks Castle every 37 months. The most recent releases landed on October 31, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Blue Defense! | Evil Ducks Castle |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | **[4.1 (9 ratings)](https://appshunter.io/ios/app/blue-defense/id295528445/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 84.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 37 months |
| Monetization | Paid | — |
| Size | 9 MB | 21 MB |
| Requires iOS | 16.0 | **12.2** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Cat in a Box Software](https://appshunter.io/developer/1600179204) | [Anthony Hindle](https://appshunter.io/developer/1057765652) |

## What reviewers say

### Blue Defense!

[App page](https://appshunter.io/ios/app/blue-defense/id295528445)

Defend your planet from an relentless invasion force. This action-packed game challenges your reflexes and strategic thinking as you manage increasing pressure from attackers. Experience classic gameplay with modern features like level selection and global leaderboards.

**Highlights:** Classic mode gameplay, Quick Start difficulty selection, Level Select for practice and medals, Global High Scores list, Save state functionality, Tilt controls for aiming

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Smooth and fast gameplay
- 👍 Unique and intuitive controls
- 💎 Retro-style graphics
- 🕹️ Addictive and challenging
- 💰 Great value for money

**What reviewers complain about**

- 🔇 Lack of sound effects and music
- 🔄 Inverted controls can be confusing
- 🧠 Difficulty ramps up too quickly
- 🔋 Can be physically tiring to play

**Reported bugs**

- Crashes on newer iOS versions
- Medals not saving properly

**Requested features**

- Add sound effects and background music
- Option to invert or adjust controls
- Gradual difficulty increase
- Power-ups and weapon upgrades
- Global high score leaderboards


### Evil Ducks Castle

[App page](https://appshunter.io/ios/app/evil-ducks-castle/id1117589870)

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

**In-app purchases:** none


## Frequently asked questions

### Is Blue Defense! free?

Blue Defense! costs $0.99, with no in-app purchases.

### Is Evil Ducks Castle free?

Evil Ducks Castle costs $0.99, with no in-app purchases.

### Do Blue Defense! or Evil Ducks Castle have ads?

Neither Blue Defense! nor Evil Ducks Castle shows ads.

### Which is updated more often, Blue Defense! or Evil Ducks Castle?

Blue Defense! ships an update every 4 months, and Evil Ducks Castle every 37 months. Most recently, Blue Defense! was updated on October 31, 2026 and Evil Ducks Castle on October 26, 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.*