# インベーダー J vs Ghost Tower

The clearest difference is update cadence: Ghost Tower at daily against インベーダー J's every 2 months. Ghost Tower also leads on iOS requirement (12.0 vs 15.6). 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.

インベーダー J ships an update every 2 months, Ghost Tower daily. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | インベーダー J | Ghost Tower |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Daily** |
| Size | 18 MB | 48 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [takayuki atsumi](https://appshunter.io/developer/1495474977) | [HIDETO KUROSE](https://appshunter.io/developer/1746917263) |

## What reviewers say

### インベーダー J

[App page](https://appshunter.io/ios/app/j-invaders-j/id1554028591)

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

**In-app purchases:** none


### Ghost Tower

[App page](https://appshunter.io/ios/app/ghost-tower/id6504737589)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is インベーダー J free?

インベーダー J is free to download, with no in-app purchases.

### Is Ghost Tower free?

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

### Do インベーダー J or Ghost Tower have ads?

Neither インベーダー J nor Ghost Tower shows ads.

### Which is updated more often, インベーダー J or Ghost Tower?

インベーダー J ships an update every 2 months, and Ghost Tower daily. Most recently, インベーダー J was updated on November 3, 2026 and Ghost Tower on November 4, 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.*