# Space Glider 2D vs Alien Defense

The clearest difference is in-app purchases: Space Glider 2D at none against Alien Defense's 3. Space Glider 2D also leads on ads (none vs shown). Alien Defense's advantage is update cadence (fortnightly vs every 5 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Alien Defense sells 3 one-off in-app purchases. Space Glider 2D asks for nothing beyond the download.

Space Glider 2D ships an update every 5 months, Alien Defense fortnightly. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Space Glider 2D | Alien Defense |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | **Fortnightly** |
| Size | 96 MB | 284 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [Serhii Chechui](https://appshunter.io/developer/1440643834) | [PLAYGENIX EDTECH INC.](https://appshunter.io/developer/6784856448) |

## What reviewers say

### Space Glider 2D

[App page](https://appshunter.io/ios/app/space-glider-2d/id1500827596)

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

**In-app purchases:** none


### Alien Defense

[App page](https://appshunter.io/ios/app/alien-defense-space-tower-rts/id6776451528)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 500 Gas | $0.99 | one-time |
| 4,000 Gas | $4.99 | one-time |
| 20,000 Gas | $19.99 | one-time |


## Frequently asked questions

### Is Space Glider 2D free?

Space Glider 2D is free to download, with no in-app purchases.

### Is Alien Defense free?

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

### Do Space Glider 2D or Alien Defense have ads?

Alien Defense shows ads; Space Glider 2D does not.

### Which is updated more often, Space Glider 2D or Alien Defense?

Space Glider 2D ships an update every 5 months, and Alien Defense fortnightly. Most recently, Space Glider 2D was updated on November 3, 2026 and Alien Defense on November 7, 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.*