# Monster Evolution vs Rio Rex

The clearest difference is ads: Rio Rex at none against Monster Evolution's shown. Rio Rex also leads on iOS requirement (9.0 vs 15.0). Monster Evolution's advantage is rating (4.6 vs 4.1) and update cadence (every 2 months vs every 11 months). On price, review sentiment, in-app purchases and monetization model there is nothing between them.

Both are free to download. Monster Evolution sells 19 one-off in-app purchases and Rio Rex sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Monster Evolution holds the better App Store score, 4.6 against 4.1. That said, the two scores are not equally well evidenced: Monster Evolution has 5.8K ratings behind it against 50, so its average is the more settled of the two. Written reviews point the same way: 77% of Monster Evolution's written reviews are positive against 74% of Rio Rex's.

Monster Evolution ships an update every 2 months, Rio Rex every 11 months. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Monster Evolution | Rio Rex |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (5.8K ratings)](https://appshunter.io/ios/app/monster-evolution-hit-and-smash/id1435300852/reviews)** | [4.1 (50 ratings)](https://appshunter.io/ios/app/rio-rex/id1446730341/reviews) |
| Number of ratings | **5.8K** | 50 |
| Positive reviews | **77.0% of reviews** | 73.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 11 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 413 MB | 434 MB |
| Requires iOS | 15.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 9+ | 12+ |
| Developer | [Anton Slyusar](https://appshunter.io/developer/1363107229) | [gametornado](https://appshunter.io/developer/456365838) |

## What reviewers say

### Monster Evolution

[App page](https://appshunter.io/ios/app/monster-evolution-hit-and-smash/id1435300852)

Control a giant, evolved monster and unleash destruction on everything in sight. Tear down buildings, crush vehicles, and flatten landscapes in this realistic demolition simulator. Upgrade your monster and unlock new abilities to become an unstoppable force.

**Highlights:** Over 10 playable monsters, Realistic destruction physics, Stunning 3D graphics, Unique and challenging levels, Immersive monster sounds, Addictive gameplay, Physics-based destruction model

**Features:** macOS Compatibility

**In-app purchases (19)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Special Offer | $0.99 | one-time |
| 1000 Radiation | $1.99 | one-time |
| Mutagen 2000 | $1.99 | one-time |
| No ADS | $2.99 | one-time |
| New monster | $3.99 | one-time |
| New monster | $5.99 | one-time |
| 4000 Radiation | $6.99 | one-time |
| Mutagen 8000 | $6.99 | one-time |
| New monster | $7.99 | one-time |
| New monster | $9.99 | one-time |
| Limited time offer | $10.99 | one-time |
| Firebreath | $11.99 | one-time |
| Laserbot | $11.99 | one-time |
| Items Meteor | $11.99 | one-time |
| New monster | $12.99 | one-time |
| 10000 Radiation | $13.99 | one-time |
| 25000 Radiation | $24.99 | one-time |
| Mutagen 50000 | $24.99 | one-time |
| 4 new monsters | $30.99 | one-time |

**What reviewers like**

- 🚀 Smooth gameplay
- 👍 Variety of playable monsters
- 🎨 Impressive graphics
- 💰 Fair monetization model

**What reviewers complain about**

- 🐛 Occasional crashes and bugs
- 🔒 Unreliable ad-based rewards
- 🔍 Limited camera controls
- 🚶‍♂️ Continuous monster movement

**Reported bugs**

- Inability to exit levels or return to menu
- Inconsistent sound and music playback
- Progression loss after crashes or updates

**Requested features**

- Multiplayer mode with PvP battles
- More monster variety including classic Kaiju
- Ability to control monster movement
- Larger and more diverse city environments


### Rio Rex

[App page](https://appshunter.io/ios/app/rio-rex/id1446730341)

Control a terrifying T-Rex rampaging through the streets of Rio, destroying buildings and feasting on humans. Unleash flaming breath and cause mayhem in this action-packed arcade game.

**Highlights:** Control a T-Rex, Destroy city buildings, Feast on humans, Use flaming breath, Arcade gameplay, Cause mayhem

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| premium user | $0.99 | one-time |


## Frequently asked questions

### Is Monster Evolution free?

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

### Is Rio Rex free?

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

### Which has better reviews, Monster Evolution or Rio Rex?

Monster Evolution is rated higher. Monster Evolution averages 4.6 out of 5 from 5.8K ratings, while Rio Rex averages 4.1 from 50 ratings.

### Do Monster Evolution or Rio Rex have ads?

Monster Evolution shows ads; Rio Rex does not.

### Which is updated more often, Monster Evolution or Rio Rex?

Monster Evolution ships an update every 2 months, and Rio Rex every 11 months. Most recently, Monster Evolution was updated on October 29, 2026 and Rio Rex 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.*