# Rex vs Alien Duel

The clearest difference is in-app purchases: Alien Duel at none against Rex's 10. Alien Duel also leads on ratings volume (75 vs 8) and iOS requirement (13.0 vs 15.0). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. Rex sells 10 one-off in-app purchases. Alien Duel asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 3.8 for Rex against 3.6 for Alien Duel. That said, the two scores are not equally well evidenced: Alien Duel has 75 ratings behind it against 8, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 3 months. Both last shipped on November 3, 2026.

## The numbers

| Metric | Rex | Alien Duel |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.8 (8 ratings)](https://appshunter.io/ios/app/rex-mahjong/id1627077156/reviews)** | [3.6 (75 ratings)](https://appshunter.io/ios/app/alien-duel-variant-war/id6444579106/reviews) |
| Number of ratings | 8 | **75** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 197 MB | 292 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Yso Corp](https://appshunter.io/developer/659815325) | [智 饶](https://appshunter.io/developer/1471602384) |

## What reviewers say

### Rex

[App page](https://appshunter.io/ios/app/rex-mahjong/id1627077156)

Match three prehistoric creatures to evolve them into a more powerful form. Then, use your evolved dinosaurs to battle against another team in this strategic puzzle game.

**Highlights:** Match-3 evolution mechanic, Dinosaur-themed gameplay, Team-based battles, Strategic puzzle elements, Prehistoric creature evolution

**Features:** macOS Compatibility

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Speed Pack | $1.99 | one-time |
| Remove Ads | $2.99 | one-time |
| MegaBrachio | $3.99 | one-time |
| MegaSarco | $3.99 | one-time |
| MegaSpino | $3.99 | one-time |
| MegaRex | $3.99 | one-time |
| Speed Pack Plus | $3.99 | one-time |
| Pack MegaSarco | $5.99 | one-time |
| Pack MegaSpino | $5.99 | one-time |
| Master Pack | $17.99 | one-time |


### Alien Duel

[App page](https://appshunter.io/ios/app/alien-duel-variant-war/id6444579106)

Compete in a unique sports event where animals race to collect colored cubes and overcome obstacles. Knock down opponents to gain blocks and reach the finish line first to win.

**Highlights:** Animal athletes competition, Collect colored cubes, Knock down opponents, Clear track obstacles, Race to the finish line

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Rex free?

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

### Is Alien Duel free?

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

### Which has better reviews, Rex or Alien Duel?

Rex is rated higher. Rex averages 3.8 out of 5 from 8 ratings, while Alien Duel averages 3.6 from 75 ratings.

### Do Rex or Alien Duel have ads?

Both Rex and Alien Duel show ads.

### Which is updated more often, Rex or Alien Duel?

Rex ships an update every 3 months, and Alien Duel every 3 months. Most recently, Rex was updated on November 3, 2026 and Alien Duel on November 3, 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.*