# E vs Sky Defense!

The clearest difference is update cadence: Sky Defense! at every 3 days against E's every 16 months. Sky Defense! also leads on iOS requirement (11.0 vs 13.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

E ships an update every 16 months, Sky Defense! every 3 days. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | E | Sky Defense! |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (1 ratings)](https://appshunter.io/ios/app/sky-defense/id6449708792/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 16 months | **Every 3 days** |
| Monetization | — | Ad-supported |
| Size | 223 MB | 148 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 9+ |
| Developer | [Full Fat Productions Ltd](https://appshunter.io/developer/374306144) | [Mustafa Ilker Goncu](https://appshunter.io/developer/1590036986) |

## What reviewers say

### E

[App page](https://appshunter.io/ios/app/e-merge-ency-services/id1659857983)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sky Defense!

[App page](https://appshunter.io/ios/app/sky-defense/id6449708792)

Build and expand your base to defend it from waves of attacking enemies. Strategically upgrade your defenses and conquer the skies.

**Highlights:** Expand your building, Defend against enemies, Strategic upgrades, Conquer the skies

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is E free?

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

### Is Sky Defense! free?

Sky Defense! is free to download, with no in-app purchases.

### Do E or Sky Defense! have ads?

Both E and Sky Defense! show ads.

### Which is updated more often, E or Sky Defense!?

E ships an update every 16 months, and Sky Defense! every 3 days. Most recently, E was updated on October 27, 2026 and Sky Defense! on October 30, 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.*