# Alien Slime vs Idle Alien

The clearest difference is price: Idle Alien at Free against Alien Slime's $0.99. Idle Alien also leads on update cadence (every 11 days vs every 14 months). Alien Slime's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

Idle Alien is free to download; Alien Slime costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Alien Slime ships an update every 14 months, Idle Alien every 11 days. The most recent releases landed on September 25, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Alien Slime | Idle Alien |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.5 (123 ratings)](https://appshunter.io/ios/app/idle-alien/id1374126355/reviews)** |
| Number of ratings | — | **123** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 14 months | **Every 11 days** |
| Monetization | — | Ad-supported |
| Size | 13 MB | 295 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 9+ | 17+ |
| Developer | [JS Digital Productions, Inc.](https://appshunter.io/developer/1012108950) | [vmoga](https://appshunter.io/developer/945300832) |

## What reviewers say

### Alien Slime

[App page](https://appshunter.io/ios/app/alien-slime/id1275567537)

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

**In-app purchases:** none


### Idle Alien

[App page](https://appshunter.io/ios/app/idle-alien/id1374126355)

Engage in a hyper-casual space war by tapping to destroy hostile spaceships. Upgrade your alien heroes to increase damage and unlock new abilities. Enjoy a stress-relieving, offline gaming experience.

**Highlights:** Tap to attack spaceships, Upgrade alien heroes, Boost damage and gold, Offline gameplay, Stress-relieving mechanics, Unlock new aliens

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Alien Slime free?

Alien Slime costs $0.99, with no in-app purchases.

### Is Idle Alien free?

Idle Alien is free to download, with no in-app purchases.

### Do Alien Slime or Idle Alien have ads?

Idle Alien shows ads; Alien Slime does not.

### Which is updated more often, Alien Slime or Idle Alien?

Alien Slime ships an update every 14 months, and Idle Alien every 11 days. Most recently, Alien Slime was updated on September 25, 2026 and Idle Alien on October 2, 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.*