# RobotVSAlien vs Invincible Gunner

The clearest difference is rating: RobotVSAlien at 4.0 against Invincible Gunner's 3.0. RobotVSAlien also leads on update cadence (every 2 weeks vs every 27 months) and iOS requirement (7.0 vs 12.0). Invincible Gunner's advantage is in-app purchases (none vs 1). On price, ratings volume, ads and device support there is nothing between them.

Both are free to download. RobotVSAlien sells 1 one-off in-app purchase. Invincible Gunner asks for nothing beyond the download.

RobotVSAlien holds the better App Store score, 4.0 against 3.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

RobotVSAlien ships an update every 2 weeks, Invincible Gunner every 27 months. The most recent releases landed on October 21, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | RobotVSAlien | Invincible Gunner |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/robotvsalien/id863067072/reviews)** | [3.0 (2 ratings)](https://appshunter.io/ios/app/invincible-gunner/id1068915829/reviews) |
| Number of ratings | 1 | **2** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 27 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 55 MB | 21 MB |
| Requires iOS | **7.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 9+ |
| Developer | [Akihiro Fujiwara](https://appshunter.io/developer/721031264) | [娟 杜](https://appshunter.io/developer/974748350) |

## What reviewers say

### RobotVSAlien

[App page](https://appshunter.io/ios/app/robotvsalien/id863067072)

Defend against alien invaders using a growing army of robots. This casual defense game allows players to upgrade and promote their units to increase their strength. Design your own giant robot and repel the alien threat.

**Highlights:** Casual defense gameplay, Unit promotion and upgrading, Design giant robots, Repel alien invaders, Unique robot and alien designs

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads and Privilege granting | $0.99 | one-time |


### Invincible Gunner

[App page](https://appshunter.io/ios/app/invincible-gunner/id1068915829)

Defend your seaside fort from pirate attacks using a single finger to aim and shoot. Progress through numerous challenging levels with a limited number of attacks per stage. Enjoy smooth graphics and realistic simulation in this free, entertaining game.

**Highlights:** One-finger aiming and shooting, Defend seaside fort, Limited attacks per level, Numerous challenging levels, Smooth graphics, Realistic simulation

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RobotVSAlien free?

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

### Is Invincible Gunner free?

Invincible Gunner is free to download, with no in-app purchases.

### Which has better reviews, RobotVSAlien or Invincible Gunner?

RobotVSAlien is rated higher. RobotVSAlien averages 4.0 out of 5 from 1 ratings, while Invincible Gunner averages 3.0 from 2 ratings.

### Do RobotVSAlien or Invincible Gunner have ads?

Neither RobotVSAlien nor Invincible Gunner shows ads.

### Which is updated more often, RobotVSAlien or Invincible Gunner?

RobotVSAlien ships an update every 2 weeks, and Invincible Gunner every 27 months. Most recently, RobotVSAlien was updated on October 21, 2026 and Invincible Gunner 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.*