---
title: "RYUKIN — App Overview"
url: https://marlvel.ai/intel-report/entertainment/com-hacoapp-aios-ryukin
category: Entertainment
developer: Masataka Hakozaki
platforms: ios
rating: 4.9 (59 ratings)
pricing: paid
report_level: overview
generated: 2026-04-24
last_verified: "2026-04-24T05:29:54.248Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** RYUKIN is a premium, highly customizable virtual aquarium focused on aesthetic relaxation and interactive ambient display.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Entertainment |
| Rating | 4.9 ★ (59) |
| Pricing | paid |
| Platforms | iOS |
| Latest Version (iOS) | 1.14.4 |
| Developer | Masataka Hakozaki |

<!-- SECTION: Summary -->
## What is RYUKIN?

RYUKIN is a digital aquarium simulation that provides a relaxing, interactive experience featuring animated goldfish. The app offers extensive customization for tank environments and includes specialized modes for accessibility and ambient use.

<!-- SECTION: Key Features -->
## Key Features

- **Interactive Fish Behavior**: Goldfish respond to touch inputs and follow the user's finger across the screen.
- **Customizable Environments**: Users can modify tank shapes, background colors, floating objects, and camera perspectives.
- **Cat & Baby Mode**: A specialized mode designed for safe interaction with kittens and toddlers.
- **Ambient Utility**: Includes a sleep timer, clock and date display, and the ability to play external music alongside water sound effects.

<!-- SECTION: Target Audience -->
## Who is it for?

Individuals seeking a relaxing, low-maintenance digital aquarium experience or interactive visual stimulation for children and pets.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/ryukin/id6471839445?uo=2)
- [Full Intelligence Report](https://marlvel.ai/intel-report/entertainment/com-hacoapp-aios-ryukin)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/intel-report/entertainment/com-hacoapp-aios-ryukin).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*