# Marimo - Moss Ball Aquarium

> Real-time Marimo moss ball growth tracker and aquarium designer. (iPhone/iPad app by Hiroki Yamada.)

- Source: https://appshunter.io/ios/app/marimo-moss-ball-aquarium/id1015123937 (this page in markdown: same URL + `.md`)
- Developer: [Hiroki Yamada](https://appshunter.io/developer/491381849)
- Category: Games, Entertainment, Family
- Price: Free
- Rating: 4.60/5 from 70 App Store ratings · 55 written reviews indexed
- Age rating: 4+
- Requires: iOS 6.0 · 50 MB
- Languages: American English, Japanese
- Released: 2015-07-14
- Data updated: 2026-09-09
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/marimo-moss-ball-aquarium/id1015123937/reviews.md

## What is Marimo?

This is the best Marimo app.
- You can know growth of Marimo in real time. This feature is available on this app only.
- Cool and beautiful aquarium.
- Simple and easy.

Marimo is a water plant looks like green ball.
Care is very easy. You should change the water only once a week.
Marimo is very small at first, but it will grow bigger little by little every day.
Enjoy the growth of Marimo in your daily life!

## Key features

- Real-time Marimo growth tracking
- Customizable aquarium design
- Simple and easy to use
- Water change reminders
- Observe Marimo growth over time

## Recent user reviews (10 of 55)

All indexed reviews: https://appshunter.io/ios/app/marimo-moss-ball-aquarium/id1015123937/reviews.md

### 5/5 — お手軽

*2026-09-06*

こう言うのでいいんだよ

### 4/5 — Its 1778…

*2026-08-08*

Thats days NOT date, so hows about an update? A hello  maybe lol

### 5/5 — 懇願

*2026-07-18*

900日育てました！！！愛を込めて込めて大きくなってくれました♡♡ですがスマホ修理のため本体交換したらすべて飛んでしまいました。。。あれから２週間経っても立ち直れません。引き継ぎ対応お願いします😭😭

### 5/5 — 1ヶ月

*2026-02-08*

1ヶ月になりました👶🏻

### 5/5 — このゲームは奥が深い

*2025-10-10*

やることがない私にはピッタリですね！

### 5/5 — 癒しをくれるマリモ飼育

*2025-07-12*

見てるだけでも癒されてゲームをやっている私達に笑顔をくれます☺️

### 5/5 — まりも可愛い！

*2025-05-23*

15日成長して結構大きくなってました♡

### 5/5 — Lil Mo’s Birthday

*2024-06-20, version 1.0*

Heyyy my Marimo is 1000 days old today 🥳✌️✨🎂

### 5/5 — 1000日

*2024-06-11*

999日で止まるのかなと思っていたら1000日超えた
クラゲとウーパールーパーもそろそろ1000日なので皆んなで仲良く2000日目指します

### 5/5 — Here’s the thing:

*2024-05-29*

So, this game is… well, for me boring. All of the hiroki yamada games are kinda boring, but they are really cute and you can feed them. This… well, it’s kinda plain without a cute face. But the OTHER marmio game made by her, it’s like this, BUT WAY MORE CUTE. But if you wanna get it, go for it. This is just my opinion.

Edit: wow y’all little kid me had no respect sorry I was this rude! 😭😂😭😂😭😂

## Frequently asked questions about Marimo

### What does this app do?

This application allows you to monitor the growth of your Marimo moss balls in real time. It also provides tools to design a beautiful and simple aquarium to house them. You can enjoy observing the gradual development of your Marimo over time.

### What are the key features of this Marimo app?

The app's standout feature is real-time Marimo growth tracking, which is unique to this application. It also offers a cool and beautiful aquarium design feature, making it simple and easy to use for all users. You can enjoy observing your Marimo's progress.

### How do I care for Marimo moss balls?

Marimo moss balls are very easy to care for. The primary care requirement is to change the water only once a week. The app helps you enjoy observing their growth, which happens little by little each day.

### Is this app free to use?

Yes, this application is completely free to use. There are no costs associated with downloading or using its features. The app is designed to be accessible for anyone interested in Marimo care.

### What is Marimo?

Marimo is a type of water plant that appears as a green ball. They are known for their ease of care and slow, steady growth. This app is designed for users who want to track and appreciate this unique aquatic plant.

## Version history (last 1 release)

### 1.0 — 2015-07-14

This app has been updated by Apple to display the Apple Watch app icon.

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## More apps by Hiroki Yamada

- [Rabbits on the Moon](https://appshunter.io/ios/app/rabbits-on-the-moon/id1009172094)
- [Goldfish Aquarium - Japanese Style -](https://appshunter.io/ios/app/goldfish-aquarium-japanese-style/id1023207502)
- [Marimo Game Free](https://appshunter.io/ios/app/marimo-game-free/id1026490638)
- [Clownfish Aquarium](https://appshunter.io/ios/app/clownfish-aquarium/id1039907687)
- [Jellyfish Aquarium - Pet Game](https://appshunter.io/ios/app/jellyfish-aquarium-pet-game/id1050599544)

All apps by Hiroki Yamada: https://appshunter.io/developer/491381849

## Related topics

[sea moss](https://appshunter.io/ios/topics/sea-moss)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-09.*