# Slime Evolution vs Robot Merge

The clearest difference is ads: Robot Merge at none against Slime Evolution's shown. Robot Merge also leads on update cadence (every 4 days vs every 2 months) and ratings volume (3.1K vs 597). Slime Evolution's advantage is review sentiment (91% vs 80%). On price, rating, in-app purchases and monetization model there is nothing between them.

Both are free to download. Slime Evolution sells 4 one-off in-app purchases and Robot Merge sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for Slime Evolution against 4.8 for Robot Merge. That said, the two scores are not equally well evidenced: Robot Merge has 3.1K ratings behind it against 597, so its average is the more settled of the two. Written reviews are what separate them: 91% of Slime Evolution's written reviews are positive against 80% of Robot Merge's.

Slime Evolution ships an update every 2 months, Robot Merge every 4 days. The most recent releases landed on October 22, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Slime Evolution | Robot Merge |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (597 ratings)](https://appshunter.io/ios/app/slime-evolution-raise-slimes/id1131103968/reviews) | **[4.8 (3.1K ratings)](https://appshunter.io/ios/app/robot-merge/id1418825045/reviews)** |
| Number of ratings | 597 | **3.1K** |
| Positive reviews | **91.2% of reviews** | 80.4% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 111 MB | 196 MB |
| Requires iOS | 13.0 | **8.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SeHyeon Im](https://appshunter.io/developer/1294084939) | [Umbrella Games LLC](https://appshunter.io/developer/1059299541) |

## What reviewers say

### Slime Evolution

[App page](https://appshunter.io/ios/app/slime-evolution-raise-slimes/id1131103968)

Cultivate a charming slime farm by merging identical slimes to discover new ones. Assign elemental properties like water, fire, or grass to influence their characteristics. Embark on adventures to collect more slimes and treasures, and document your discoveries in a field guide.

**Highlights:** Create new slimes by merging, Assign elemental properties (water, fire, grass), Go on adventures for rewards, Collect slimes in a field guide, Discover unique slime evolution methods

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 20 Gem | $0.99 | one-time |
| 110 Gem | $4.99 | one-time |
| 240 Gem | $9.99 | one-time |
| 1400 Gem | $49.99 | one-time |

**What reviewers like**

- 👍 Cute and relaxing game
- 🎨 Charming art style
- 🕹️ Simple and addictive gameplay
- ⏱️ Good time-killer
- 🌳 Enjoyable exploration and evolution

**What reviewers complain about**

- 🐛 Occasional bugs and glitches
- 💰 Unbalanced upgrade costs between platforms
- 🔍 Unclear mechanics (e.g. using seeds)
- 🌐 Language/localization issues

**Reported bugs**

- Inability to merge certain slime types
- Disappearing slimes and lost progress
- Ads not working or causing errors

**Requested features**

- Add more types of slimes
- Implement a slime shop/store
- Improve the reward system
- Add more gameplay modes or mini-games
- Enhance the exploration and progression systems


### Robot Merge

[App page](https://appshunter.io/ios/app/robot-merge/id1418825045)

Merge identical robots to discover and collect 60 unique machines. Upgrade your buildings, earn coins, and expand your robot empire in this addictive collection game.

**Highlights:** Merge identical robots, Discover 60 unique machines, Upgrade buildings, Earn coins, Expand your world

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Budget Pack | $1.99 | one-time |
| Crate Of Gems | $4.99 | one-time |
| Shipment Of Gems | $9.99 | one-time |
| Mountain Of Gems | $29.99 | one-time |

**What reviewers like**

- 🤖 Excellent game
- 🤖 AWESOMEEE!!!!!
- 👍 Good, good, thanks for making this
- 🌟 Very calming
- 🤖 I like upgrading robots!

**What reviewers complain about**

- 🔒 Privacy concerns
- 🐛 Double charged for an in-app purchase
- 💰 Childrens game with NSFW ads
- 🐛 Needs an update badly!
- 🔍 Ads on a decent game

**Reported bugs**

- Lucky merges have stopped working
- Glitch where it chips gems when upgrading robots
- App freezing issues
- Incompatible with older devices
- Login screen freezes

**Requested features**

- More robots and other stages or worlds
- Leaderboard
- Auto assign robots to mines/buildings
- Dark mode option
- Advanced analytics dashboard


## Frequently asked questions

### Is Slime Evolution free?

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

### Is Robot Merge free?

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

### Which has better reviews, Slime Evolution or Robot Merge?

Robot Merge is rated higher. Slime Evolution averages 4.8 out of 5 from 597 ratings, while Robot Merge averages 4.8 from 3.1K ratings.

### Do Slime Evolution or Robot Merge have ads?

Slime Evolution shows ads; Robot Merge does not.

### Which is updated more often, Slime Evolution or Robot Merge?

Slime Evolution ships an update every 2 months, and Robot Merge every 4 days. Most recently, Slime Evolution was updated on October 22, 2026 and Robot Merge on October 21, 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.*