# Tower Defense vs Alien Attack

The clearest difference is in-app purchases: Alien Attack at none against Tower Defense's 4. Alien Attack also leads on update cadence (daily vs every 3 days) and iOS requirement (15.0 vs 26.2). Tower Defense's advantage is ads (none vs shown). On price and device support there is nothing between them.

Both are free to download. Tower Defense sells 4 one-off in-app purchases. Alien Attack asks for nothing beyond the download.

Tower Defense ships an update every 3 days, Alien Attack daily. The most recent releases landed on October 2, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Tower Defense | Alien Attack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (3 ratings)](https://appshunter.io/ios/app/alien-attack-rpg-idle-action/id6778897821/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 days | **Daily** |
| Monetization | — | Ad-supported |
| Size | 23 MB | 180 MB |
| Requires iOS | 26.2 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 12+ | 12+ |
| Developer | [Jonathan Taveras](https://appshunter.io/developer/1270478820) | [HAPPY GAME COMPANY TEKNOLOJI ANONIM SIRKETI](https://appshunter.io/developer/1523367113) |

## What reviewers say

### Tower Defense

[App page](https://appshunter.io/ios/app/tower-defense-void/id6762655620)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Starter Pack | $2.99 | one-time |
| Standard Pack | $9.99 | one-time |
| Pro Pack | $24.99 | one-time |
| Elite Pack | $69.99 | one-time |


### Alien Attack

[App page](https://appshunter.io/ios/app/alien-attack-rpg-idle-action/id6778897821)

Control a rapidly evolving alien lifeform and conquer Earth. Consume humans to grow stronger, unlock new mutations, and dominate every battlefield. Upgrade your abilities and spread your alien domination across the planet.

**Highlights:** Evolve alien lifeform, Consume humans for energy, Unlock new mutations and powers, Action-packed battles, Upgrade abilities, Conquer world locations

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

**In-app purchases:** none


## Frequently asked questions

### Is Tower Defense free?

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

### Is Alien Attack free?

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

### Do Tower Defense or Alien Attack have ads?

Alien Attack shows ads; Tower Defense does not.

### Which is updated more often, Tower Defense or Alien Attack?

Tower Defense ships an update every 3 days, and Alien Attack daily. Most recently, Tower Defense was updated on October 2, 2026 and Alien Attack on October 5, 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.*