# Slime Evolution vs True Happiness

The clearest difference is in-app purchases: True Happiness at none against Slime Evolution's 4. Slime Evolution's advantage is update cadence (every 2 months vs every 12 months) and review sentiment (91% vs 69%). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Slime Evolution sells 4 one-off in-app purchases. True Happiness asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for Slime Evolution against 4.9 for True Happiness. Both are backed by a comparable volume of ratings — 598 and 241 respectively. Written reviews are what separate them: 91% of Slime Evolution's written reviews are positive against 69% of True Happiness's.

Slime Evolution ships an update every 2 months, True Happiness every 12 months. The most recent releases landed on November 6, 2026 and November 7, 2026 respectively.

## The numbers

| Metric | Slime Evolution | True Happiness |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.8 (598 ratings)](https://appshunter.io/ios/app/slime-evolution-raise-slimes/id1131103968/reviews) | **[4.9 (241 ratings)](https://appshunter.io/ios/app/true-happiness/id1576482666/reviews)** |
| Number of ratings | **598** | 241 |
| Positive reviews | **91.2% of reviews** | 69.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | **Every 2 months** | Every 12 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 111 MB | 169 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 9+ |
| Developer | [SeHyeon Im](https://appshunter.io/developer/1294084939) | [ponos corporation](https://appshunter.io/developer/297248421) |

## 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


### True Happiness

[App page](https://appshunter.io/ios/app/true-happiness/id1576482666)

Embark on a journey through vibrant worlds with simple touch controls. Collect coins, avoid enemies, and unlock unique poses. Decorate your personal space with collected items and enjoy playful music. This game aims to provide a stress-relieving and feel-good experience.

**Highlights:** Easy touch controls, Colorful meditation stages, Unlockable poses, Stress-relieving living space, Interior shop for customization, Playful background music

**In-app purchases:** none

**What reviewers like**

- 😌 Makes users happy
- 👍 Deep gameplay and story
- 😄 Unique and strange gameplay
- 😂 Makes users laugh
- 🧘 Calming and relaxing experience

**What reviewers complain about**

- ⚠️ Too many ads
- 😵 Frustrating ads
- ❌ Ads impede enjoyment
- ❓ Unclear objectives
- 😩 Repetitive gameplay

**Reported bugs**

- 🐛 App crashes on startup
- 🐛 App does not open
- 🐛 App closes immediately after launch
- 🐛 App crashes when opening
- 🐛 App crashes after starting

**Requested features**

- Option to remove ads via in-app purchase
- Integration with Battle Cats
- More mission variety


## Frequently asked questions

### Is Slime Evolution free?

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

### Is True Happiness free?

True Happiness is free to download, with no in-app purchases.

### Which has better reviews, Slime Evolution or True Happiness?

True Happiness is rated higher. Slime Evolution averages 4.8 out of 5 from 598 ratings, while True Happiness averages 4.9 from 241 ratings.

### Do Slime Evolution or True Happiness have ads?

Both Slime Evolution and True Happiness show ads.

### Which is updated more often, Slime Evolution or True Happiness?

Slime Evolution ships an update every 2 months, and True Happiness every 12 months. Most recently, Slime Evolution was updated on November 6, 2026 and True Happiness on November 7, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*