# Invader Sisters vs Retro 8

The clearest difference is update cadence: Invader Sisters at every 2 weeks against Retro 8's every 4 months. Invader Sisters also leads on iOS requirement (12.0 vs 16.0). 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.

Invader Sisters ships an update every 2 weeks, Retro 8 every 4 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Invader Sisters | Retro 8 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/retro-8-bit-game-invadersidle/id6499149308/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | **Every 2 weeks** | Every 4 months |
| Monetization | — | Ad-supported |
| Size | 19 MB | 4 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ERX](https://appshunter.io/developer/513941286) | [Masaharu Tsukamoto](https://appshunter.io/developer/939316877) |

## What reviewers say

### Invader Sisters

[App page](https://appshunter.io/ios/app/invader-sisters/id939103577)

**Features:** macOS Compatibility

**In-app purchases:** none


### Retro 8

[App page](https://appshunter.io/ios/app/retro-8-bit-game-invadersidle/id6499149308)

Experience a simplified take on classic arcade space combat. Control your ship with simple swipes, and watch it automatically defend itself when idle. Level up your shooter by collecting experience to conquer increasingly challenging stages.

**Highlights:** Simple left/right swipe controls, Automatic operation when idle, Collect experience to power up shooter, Clear high-level stages, Retro 8-bit graphics

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

**In-app purchases:** none


## Frequently asked questions

### Is Invader Sisters free?

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

### Is Retro 8 free?

Retro 8 is free to download, with no in-app purchases.

### Do Invader Sisters or Retro 8 have ads?

Both Invader Sisters and Retro 8 show ads.

### Which is updated more often, Invader Sisters or Retro 8?

Invader Sisters ships an update every 2 weeks, and Retro 8 every 4 months. Most recently, Invader Sisters was updated on October 26, 2026 and Retro 8 on October 24, 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.*