# Blue Defense vs THUNDON

The clearest difference is price: Blue Defense at Free against THUNDON's $0.99. Blue Defense also leads on update cadence (every 3 months vs every 10 months). THUNDON's advantage is in-app purchases (none vs 1) and iOS requirement (11.0 vs 16.0). On ads and device support there is nothing between them.

Blue Defense is free to download; THUNDON costs $0.99 up front. Blue Defense sells 1 one-off in-app purchase. THUNDON asks for nothing beyond the download.

Blue Defense ships an update every 3 months, THUNDON every 10 months. The most recent releases landed on October 23, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Blue Defense | THUNDON |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[4.3 (20 ratings)](https://appshunter.io/ios/app/blue-defense-second-wave/id389817492/reviews)** | — |
| Number of ratings | **20** | — |
| Positive reviews | 81.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 10 months |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 45 MB |
| Requires iOS | 16.0 | **11.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 9+ | 4+ |
| Developer | [Cat in a Box Software](https://appshunter.io/developer/1600179204) | [Hideki Kubo](https://appshunter.io/developer/1512674908) |

## What reviewers say

### Blue Defense

[App page](https://appshunter.io/ios/app/blue-defense-second-wave/id389817492)

Defend your planet from alien invaders using a powerful cannon. Engage in intense arcade action with various game modes, leaderboards, and unlockable content. Enjoy updated retro graphics and flexible controls.

**Highlights:** Planet cannon for mass enemy destruction, Gauntlet mode to win the game, Infinite-Classic and Infinite-Quickstart modes, Level select with medal earning, 74 global leaderboards, Automatic save state, Multi-touch and tilt controls

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Content | $1.99 | one-time |


### THUNDON

[App page](https://appshunter.io/ios/app/thundon/id1515064459)

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

**In-app purchases:** none


## Frequently asked questions

### Is Blue Defense free?

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

### Is THUNDON free?

THUNDON costs $0.99, with no in-app purchases.

### Do Blue Defense or THUNDON have ads?

Neither Blue Defense nor THUNDON shows ads.

### Which is updated more often, Blue Defense or THUNDON?

Blue Defense ships an update every 3 months, and THUNDON every 10 months. Most recently, Blue Defense was updated on October 23, 2026 and THUNDON on October 27, 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.*