# Medaka Breeder vs MarimoSimulator

The clearest difference is ads: Medaka Breeder at none against MarimoSimulator's shown. Medaka Breeder also leads on update cadence (every 5 days vs every 3 weeks) and ratings volume (17 vs 2). MarimoSimulator's advantage is rating (5.0 vs 4.6) and review sentiment (83% vs 67%). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

MarimoSimulator holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Medaka Breeder has 17 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 67% of Medaka Breeder's written reviews are positive against 83% of MarimoSimulator's.

Medaka Breeder ships an update every 5 days, MarimoSimulator every 3 weeks. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Medaka Breeder | MarimoSimulator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.6 (17 ratings)](https://appshunter.io/ios/app/medaka-breeder/id6453882680/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/marimosimulator/id6503089573/reviews)** |
| Number of ratings | **17** | 2 |
| Positive reviews | 66.7% of reviews | **83.3% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 5 days** | Every 3 weeks |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 91 MB | 289 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Taiho Yanase](https://appshunter.io/developer/1699588464) | [Takuma Takahashi](https://appshunter.io/developer/1704744113) |

## What reviewers say

### Medaka Breeder

[App page](https://appshunter.io/ios/app/medaka-breeder/id6453882680)

Experience realistic fish keeping by feeding and cleaning your virtual fish. Watch them grow, breed, and inherit traits from their parents. Customize aquariums and collect various fish species.

**Highlights:** Realistic killifish keeping simulation, Breed fish and inherit traits, Customize aquariums with decorations, Collect over 46 types of killifish, Missions and rewards system, Observation and shooting modes

**Features:** macOS Compatibility

**In-app purchases:** none


### MarimoSimulator

[App page](https://appshunter.io/ios/app/marimosimulator/id6503089573)

Experience daily relaxation by raising fluffy, cute marimo. Enjoy visual effects by switching lights and soothing music. This simple idle game is perfect for killing time and finding peace.

**Highlights:** Idle marimo breeding, Relaxing gameplay, Visual light effects, Soothing music, Simple controls, Tank cleaning mechanic

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Medaka Breeder free?

Medaka Breeder is free to download, with no in-app purchases.

### Is MarimoSimulator free?

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

### Which has better reviews, Medaka Breeder or MarimoSimulator?

MarimoSimulator is rated higher. Medaka Breeder averages 4.6 out of 5 from 17 ratings, while MarimoSimulator averages 5.0 from 2 ratings.

### Do Medaka Breeder or MarimoSimulator have ads?

MarimoSimulator shows ads; Medaka Breeder does not.

### Which is updated more often, Medaka Breeder or MarimoSimulator?

Medaka Breeder ships an update every 5 days, and MarimoSimulator every 3 weeks. Most recently, Medaka Breeder was updated on November 3, 2026 and MarimoSimulator on November 4, 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.*