# Koi - Aquarium — Beautiful koi and healing time

> Relaxing virtual aquarium simulation with koi and goldfish. (iPhone/iPad app by HAREPPO.)

- Source: https://appshunter.io/ios/app/koi-aquarium/id1558420605 (this page in markdown: same URL + `.md`)
- Developer: [HAREPPO](https://appshunter.io/developer/604325074)
- Category: Games, Graphics & Design, Simulation, Word
- Price: Free
- Rating: 4.20/5 from 35 App Store ratings · 3 written reviews indexed
- Age rating: 12+
- Requires: iOS 12.0 · 126 MB
- Languages: American English, Catalan, French (France), German (Germany), Japanese, Korean, Chinese (Simplified, China), European Spanish
- Released: 2021-04-05
- Data updated: 2026-08-22
- Monetization: ad-supported
- User reviews in markdown: https://appshunter.io/ios/app/koi-aquarium/id1558420605/reviews.md

## What is Koi?

* How to play
There are no difficult elements, basically you just look at the beautiful carp and goldfish.
Move your point of view and observe the carp and goldfish from various angles.


* How to increase carp and goldfish?
Tap to increase the favorability of carp and goldfish, and you can also purchase the number of carp and goldfish by exchanging favorability for diamonds (in-game currency) at the shop.

You can also get diamonds by watching mini games and advertisements, so please use it.

## Key features

- Observe koi and goldfish
- Change viewing angles
- Increase fish favorability
- Purchase fish with in-game currency
- Earn currency via mini-games and ads

## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/koi-aquarium/id1558420605/reviews.md

### 1/5 — Sad Koy

*2025-06-14*

Seemingly unusable.

### 2/5 — 運営さんお願い！！

*2025-03-28, version 1.0.4*

錦鯉を飼いたいけど自分が障害で飼えない…そんな時に見つけたリアルな錦鯉を観察・飼育できる素晴らしいアプリでした。もっと沢山の鯉を増やしたいと思ったのに、広告動画を視聴しようとしてもうんともすんとも作動しません。運営の方、どうか修正をお願いします！

### 4/5 — う

*2024-08-09, version 1.0.4*

bgmどうもどすん？

## Frequently asked questions about Koi

### What is Koi - Aquarium?

Koi - Aquarium is a casual game where you observe and interact with virtual koi and goldfish in a relaxing aquarium environment. You can change your viewpoint, increase the fish's favorability, and collect more fish.

### How do I get more fish in Koi - Aquarium?

You can increase the favorability of your fish by tapping on them. High favorability can be exchanged for diamonds, the in-game currency, which can then be used to purchase more carp and goldfish in the shop.

### Can I play Koi - Aquarium offline?

The provided description does not specify offline play capabilities for Koi - Aquarium. It is recommended to check the app store listing for definitive information on offline mode.

### Does Koi - Aquarium have ads?

Yes, Koi - Aquarium contains advertisements. You can also earn in-game currency by watching advertisements.

### What devices support Koi - Aquarium?

Koi - Aquarium is supported on iPhone, iPad, and iPod devices. It is designed for iOS users.

### How often is Koi - Aquarium updated?

The latest version of Koi - Aquarium is 1.0.4, last updated on July 28, 2024. This indicates recent development and potential for future updates.

### What is the age rating for Koi - Aquarium?

Koi - Aquarium has an age rating of 12+. This suggests it is suitable for users aged 12 and above.

### What are the main gameplay mechanics in Koi - Aquarium?

The primary gameplay involves observing beautiful koi and goldfish, changing your point of view to see them from different angles, and interacting with them to increase their favorability.

## Version history (last 3 releases)

### 1.0.4 — 2024-07-28

fix bugs.

### 1.0.3 — 2022-02-16

Clarified the amount of rewards that can be obtained from advertising videos.

### 1.0.2 — 2021-03-26

No release notes.

## Apps similar to Koi

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Splash — Fish Aquarium](https://appshunter.io/ios/app/splash-fish-aquarium/id960080321) | 4.7 (6,345) | Free | Games |
| [Fish Tycoon 2 Virtual Aquarium](https://appshunter.io/ios/app/fish-tycoon-2-virtual-aquarium/id1194725957) | 4.2 (3,819) | Free | Games |
| [Fish Farm 3 - Aquarium](https://appshunter.io/ios/app/fish-farm-3-aquarium/id1196055246) | 4.6 (6,555) | Free | Games |
| [Paradise - Fish Aquarium](https://appshunter.io/ios/app/paradise-fish-aquarium/id1166830239) | 4.6 (3,532) | Free | Games |
| [Goldfish - Aquarium Fish Tank](https://appshunter.io/ios/app/goldfish-aquarium-fish-tank/id1543722118) | 4.8 (1,344) | Free | Games |
| [Zoo Craft - Animal Park Tycoon](https://appshunter.io/ios/app/zoo-craft-animal-park-tycoon/id1247409901) | 4.6 (7,145) | Free | Games |

## More apps by HAREPPO

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- [くまモンのスピード](https://appshunter.io/ios/app/id715478563)
- [大富豪 くまモンバージョン](https://appshunter.io/ios/app/id723576661)
- [くまモンの花札（こいこい）](https://appshunter.io/ios/app/id975095311)
- [Shogi - Shogi board](https://appshunter.io/ios/app/shogi-shogi-board/id1071529426)

All apps by HAREPPO: https://appshunter.io/developer/604325074

## Related topics

[koi fish aquarium](https://appshunter.io/ios/topics/koi-fish-aquarium) · [gold fish swim](https://appshunter.io/ios/topics/gold-fish-swim) · [koi fish](https://appshunter.io/ios/topics/koi-fish) · [koi fish game](https://appshunter.io/ios/topics/koi-fish-game)

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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 2026-08-22.*