# Rat Killer Robot Invasion vs Alien Attack Idle Simulator 3D

The clearest difference is update cadence: Alien Attack Idle Simulator 3D at every 4 days against Rat Killer Robot Invasion's every 10 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Rat Killer Robot Invasion sells 17 in-app purchases, starting at $4.99 per 7 days and Alien Attack Idle Simulator 3D sells 11 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

Rat Killer Robot Invasion ships an update every 10 days, Alien Attack Idle Simulator 3D every 4 days. The most recent releases landed on September 24, 2026 and May 16, 2026 respectively.

## The numbers

| Metric | Rat Killer Robot Invasion | Alien Attack Idle Simulator 3D |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (2K ratings)](https://appshunter.io/ios/app/rat-killer-robot-invasion/id6464372285/reviews)** | — |
| Number of ratings | **2K** | — |
| Positive reviews | 31.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 10 days | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 353 MB | 175 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 4+ |
| Developer | [TapNation](https://appshunter.io/developer/1483575279) | [APPWILL COMPANY LTD](https://appshunter.io/developer/1761313938) |

## What reviewers say

### Rat Killer Robot Invasion

[App page](https://appshunter.io/ios/app/rat-killer-robot-invasion/id6464372285)

Embark on an epic quest to exterminate waves of invading rats with futuristic weapons. Collect in-game currency to unlock new zones, upgrade your robot companion, and customize its appearance. Explore diverse worlds and face challenging puzzles and boss battles.

**Highlights:** Rat extermination action, Robot customization, Weapon collection and upgrades, Diverse world exploration, Puzzles and boss battles, Collect money and gems

**Features:** macOS Compatibility

**In-app purchases (17)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VIP Membership - Weekly | $4.99 | per 7 days |
| Elite Membership - Weekly | $8.99 | per 7 days |
| Elite Membership - Monthly | $24.99 | per month |
| Skip It - Small Pack | $0.99 | one-time |
| One Time Offer | $1.99 | one-time |
| Handful Of Crystals | $1.99 | one-time |
| Bunch Of Crystals | $4.99 | one-time |
| Skip It - Medium Pack | $8.99 | one-time |
| Pile Of Crystals | $8.99 | one-time |
| Rats Pass | $9.99 | one-time |
| Small Bundle | $11.99 | one-time |
| Master Mode | $15.99 | one-time |
| Starter Pack | $15.99 | one-time |
| Medium Bundle | $24.99 | one-time |
| Limited Offer Pack | $29.99 | one-time |
| Premium Offer | $39.99 | one-time |
| Crate Of Crystals | $89.99 | one-time |

**What reviewers like**

- 👍 Fun gameplay
- 🦂 Scorpion mech character

**What reviewers complain about**

- 🐛 Glitchy and buggy
- 🕰️ Excessive ads
- ⚠️ Imbalanced game mechanics
- 💰 Progression blocked by premium currency

**Reported bugs**

- Character flipping upside down or flying across the board
- NPCs getting stuck in portals or on walls
- Incorrect item/reward drops from chests
- Launching player off the screen
- Robot unable to keep legs on the ground and rolling around

**Requested features**

- Optimize performance and fix bugs
- Improve game balance and progression
- Add more content and features
- Provide better customer support


### Alien Attack Idle Simulator 3D

[App page](https://appshunter.io/ios/app/alien-attack-idle-simulator-3d/id6686404136)

**Features:** macOS Compatibility

**In-app purchases (11)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Little kit with currencys | $1.99 | one-time |
| Classic starter pack | $1.99 | one-time |
| Premium personalized kit | $1.99 | one-time |
| Premium starter pack | $3.29 | one-time |
| All premium starter pack | $3.69 | one-time |
| Medium kit with currencys | $5.49 | one-time |
| 600 Crystals | $7.39 | one-time |
| Big kit with currencys | $8.99 | one-time |
| All kit with currencys | $9.29 | one-time |
| 1100 Crystals | $12.99 | one-time |
| 1000 Crystals | $12.99 | one-time |


## Frequently asked questions

### Is Rat Killer Robot Invasion free?

Rat Killer Robot Invasion is free to download, with in-app purchases available.

### Is Alien Attack Idle Simulator 3D free?

Alien Attack Idle Simulator 3D is free to download, with in-app purchases available.

### Do Rat Killer Robot Invasion or Alien Attack Idle Simulator 3D have ads?

Both Rat Killer Robot Invasion and Alien Attack Idle Simulator 3D show ads.

### Which is updated more often, Rat Killer Robot Invasion or Alien Attack Idle Simulator 3D?

Rat Killer Robot Invasion ships an update every 10 days, and Alien Attack Idle Simulator 3D every 4 days. Most recently, Rat Killer Robot Invasion was updated on September 24, 2026 and Alien Attack Idle Simulator 3D on May 16, 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.*