# Yen Koi: Relax & Sleep — Meditation, Breathing & Peace

> Meditation, Breathing & Peace (iPhone/iPad app by SON TUNG.)

- Source: https://appshunter.io/ios/app/yen-koi-relax-and-sleep/id6812150895 (this page in markdown: same URL + `.md`)
- Developer: [SON TUNG](https://appshunter.io/developer/486079249)
- Category: Health & Fitness, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.6 · 81 MB
- Languages: American English
- Released: 2026-09-30
- Data updated: 2026-10-29

## What is Yen Koi?

Breathe with a koi. Unwind by the water. Let the day soften.

Yen Koi brings gentle breathing, relaxing music, and a peaceful koi pond into one quiet space. Take a short pause between tasks, slow down after a busy day, or settle in with music at bedtime.

- Breathe with your koi
Follow a single koi as a soft circle of light expands and contracts to guide your breathing. The other fish gently fade away, giving you one peaceful movement to follow.

- Unwind at your own pace
Watch your koi glide through the water, create little ripples with a tap, and enjoy a quiet moment by the pond.

- Settle in for sleep
Start Sleep mode and keep listening with your screen locked. Choose a sleep timer and let the music fade out when your session ends.

- Find your soundtrack
Explore relaxing music and nature sounds. Listen to the included tracks offline, or import your own music from Files.

- Make the pond your own
Choose from five garden styles, including a gentle fountain and a forest waterfall. Explore four seasons and adjust the lighting to suit your mood.

- Make time for yourself
Start with a ready-made quiet moment, save your favorite setup, and choose optional reminders at times that work for you.

Get started with free quiet moments. Yen Premium unlocks unlimited Unwind, Breathe, and Sleep sessions and lets you welcome new koi from the collection. Enjoying the pond and caring for the koi you already have remain free.

Yen Premium is available through monthly or yearly subscriptions. Subscriptions renew automatically unless canceled. Manage or cancel your subscription in your App Store account settings.

Terms of Use: https://sontung.app/term-of-use/
Privacy Policy: https://sontung.app/privacy/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| YEARLY PREMIUM | $49.99 | per year |
| MONTHLY PREMIUM | $9.99 | per month |


## Is Yen Koi safe?

Not enough ratings yet to assess Yen Koi.

## Is Yen Koi legit?

Yen Koi: Relax & Sleep appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Yen Koi is 75 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-09-30

No release notes.

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All apps by SON TUNG: https://appshunter.io/developer/486079249

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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 2026-10-29.*