# Alien World vs SynthStack

The clearest difference is review sentiment: SynthStack at 100% against Alien World's 47%. SynthStack also leads on rating (5.0 vs 4.5) and update cadence (every 2 days vs every 5 weeks). Alien World's advantage is ads (none vs shown) and ratings volume (2.2K vs 1). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Alien World sells 7 one-off in-app purchases and SynthStack sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

SynthStack holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Alien World has 2.2K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 47% of Alien World's written reviews are positive against 100% of SynthStack's.

Alien World ships an update every 5 weeks, SynthStack every 2 days. The most recent releases landed on October 23, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Alien World | SynthStack |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2.2K ratings)](https://appshunter.io/ios/app/alien-world-dbd-alien-games/id1617026166/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/synthstack-block-puzzle-game/id6504832555/reviews)** |
| Number of ratings | **2.2K** | 1 |
| Positive reviews | 46.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 2 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 250 MB | 22 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [Iram Shehzad](https://appshunter.io/developer/1609736535) | [Nurullah Macun](https://appshunter.io/developer/1754005758) |

## What reviewers say

### Alien World

[App page](https://appshunter.io/ios/app/alien-world-dbd-alien-games/id1617026166)

Engage in thrilling 3D Sci-Fi war missions with unlimited sniper and commando action. This offline FPS game offers a campaign mode and team deathmatch with intelligent enemies. Become a super soldier and conquer the battlefield in this free-to-play adventure.

**Highlights:** 3D Sci-Fi war missions, Unlimited sniper and commando gameplay, Offline FPS mode, Campaign mode, Team Deathmatch, Intelligent enemies

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Open Theme One All Levels | $14.99 | one-time |
| Unlock Theme 2 All Levels | $14.99 | one-time |
| Unlock Theme 3 All Levels | $14.99 | one-time |
| Remove Ads | $19.99 | one-time |
| Unlock All Weapons | $29.99 | one-time |
| Open All Levels of Game | $29.99 | one-time |
| Unlock Everything | $49.99 | one-time |

**What reviewers like**

- 👍 Fun alien shooter game
- 🚀 Good graphics
- ⭐ Awesome game
- 🎮 Cool levels

**What reviewers complain about**

- 🐛 Glitchy and freezes a lot
- 🔋 Too many ads
- 🤖 False advertising (wrong aliens shown)
- 🔫 Shooting health packs is wasteful

**Reported bugs**

- Game starts in the middle of an ad
- Freezes when trying to buy new weapons
- Crashes when moving
- Doesn't look like the screenshots

**Requested features**

- Add more updates
- Allow skin/character customization
- Add a boss fight
- Limit the number of aliens


### SynthStack

[App page](https://appshunter.io/ios/app/synthstack-block-puzzle-game/id6504832555)

A neon-lit puzzle game set in a cyberpunk world. Stack and align vibrant shapes to clear levels, challenging your strategy and reflexes with retro-futuristic visuals and immersive soundscapes.

**Highlights:** Neon-lit cyberpunk world, Stack and align vibrant shapes, Retro-futuristic visuals, Immersive soundscapes, Strategy and reflex challenges, High score chasing

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $2.99 | one-time |


## Frequently asked questions

### Is Alien World free?

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

### Is SynthStack free?

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

### Which has better reviews, Alien World or SynthStack?

SynthStack is rated higher. Alien World averages 4.5 out of 5 from 2.2K ratings, while SynthStack averages 5.0 from 1 ratings.

### Do Alien World or SynthStack have ads?

SynthStack shows ads; Alien World does not.

### Which is updated more often, Alien World or SynthStack?

Alien World ships an update every 5 weeks, and SynthStack every 2 days. Most recently, Alien World was updated on October 23, 2026 and SynthStack on October 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.*