Invader Sisters vs Retro 8
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
Invader Sisters
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Aim the high score to defeat the enemy invaders! Anyone can play easily, it is a shooting game.
Retro 8
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.
- Simple left/right swipe controls
- Automatic operation when idle
- Collect experience to power up shooter
- Clear high-level stages
- Retro 8-bit graphics
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Retro and simple Space Invaders made easier on your smartphone! Only a simple left/right swipe is needed to control the game! The game switches to automatic operation when left unattended. Collect experience values to make your shooter stronger and clear high-level stages!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Invader Sisters | Retro 8 |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 1 — better |
| Update frequency | Every 2 weeks — better | Every 4 months |
| Ads | Yes | Yes |
| In-app purchases | No | No |
| Monetization | — | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 19 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | ERX | Masaharu Tsukamoto |
In-app purchases
Invader Sisters
No in-app purchases
Retro 8
No in-app purchases
