# Blue Defense vs Sky Run

The clearest difference is ads: Blue Defense at none against Sky Run's shown. Sky Run's advantage is update cadence (weekly vs every 3 months) and iOS requirement (13.0 vs 16.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Blue Defense sells 1 one-off in-app purchase and Sky Run sells 8 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Blue Defense ships an update every 3 months, Sky Run weekly. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Blue Defense | Sky Run |
| --- | --- | --- |
| Price | Free | Free |
| 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 | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Weekly** |
| Monetization | Free with in-app purchases | — |
| Size | 16 MB | 331 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 9+ | 4+ |
| Developer | [Cat in a Box Software](https://appshunter.io/developer/1600179204) | [JIN HWAN KIM](https://appshunter.io/developer/576623931) |

## 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 |


### Sky Run

[App page](https://appshunter.io/ios/app/sky-run-geometry-jump/id6749869934)

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Aveline | $2.99 | one-time |
| Isabeau | $2.99 | one-time |
| Rowena | $2.99 | one-time |
| Lyra | $2.99 | one-time |
| Arwen | $3.99 | one-time |
| Coraline | $3.99 | one-time |
| Selene | $3.99 | one-time |
| Zinnia | $4.99 | one-time |


## Frequently asked questions

### Is Blue Defense free?

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

### Is Sky Run free?

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

### Do Blue Defense or Sky Run have ads?

Sky Run shows ads; Blue Defense does not.

### Which is updated more often, Blue Defense or Sky Run?

Blue Defense ships an update every 3 months, and Sky Run weekly. Most recently, Blue Defense was updated on October 23, 2026 and Sky Run on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*