# Mugen Sound — Your Ultimate Soundscape.

> Ambient sound mixer for focus, sleep, and noise masking with custom playlists. (iPhone/iPad app by Koichiro Kamada.)

- Source: https://appshunter.io/ios/app/mugen-sound/id6748948810 (this page in markdown: same URL + `.md`)
- Developer: [Koichiro Kamada](https://appshunter.io/developer/476534292)
- Category: Health & Fitness, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.0 · 23 MB
- Languages: American English, French (France), German (Germany), Indonesian, Italian, Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish and 2 more
- Released: 2025-11-12
- Data updated: 2026-08-24
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/mugen-sound/id6748948810/reviews.md

## What is Mugen Sound?

■ What is Mugen Sound?

Mugen Sound is the ultimate ambient sound app that enriches your life through the power of sound. Combining cutting-edge audio content with advanced playback technology.

■ Focus, Sleep, and Noise Masking—All with a Single Tap

Mix natural sounds with color noise to create your perfect environment.
Automate your routine with custom durations like "25 min focus + 5 min break."
Seamless infinite loops that never break immersion.

■ Unique Features

▼ Mix Multiple Sounds Freely
Ocean waves + pink noise, forest sounds + brown noise—
Create your ideal soundscape with any combination you like.

▼ Set Individual Playback Duration for Each Sound
"25 minutes of brown noise for focus, then 5 minutes of ocean waves to refresh."
With playlist functionality, customize the duration for each sound.
Perfect for Pomodoro Technique or bedtime routines—all automated.

▼ Uninterrupted Immersion
Smooth, seamless infinite loops with no jarring transitions.
Ambient sounds continue endlessly without interruption.

▼ Professional-Grade Binaural Recording
Created in collaboration with okidesign, a sound design company.
Recorded in locations across Japan—Hinuma in Ibaraki, Namie in Fukushima, Sakura in Chiba—
these binaural recordings make you feel like you're actually there when listening with headphones.

▼ Visual Soundscapes That Soothe
Beautiful visualizers (toggle on/off) respond to sound frequencies and move dynamically.
Deep immersion through both sight and sound.

■ Rich Feature Set

- Mix multiple sounds freely
- Create playlists with custom durations
- Curated natural sounds and color noise (6 types)
- Fine-tune volume for each sound individually
- Proprietary auto-balancing for consistent volume levels
- Play simultaneously with other apps (layer music + ambient sounds)
  *Subject to other app specifications
- Pomodoro timer with interval notifications
- Sleep timer (auto-stop)
- Offline playback support
- No sign-up required

■ Perfect For

【Work & Study】
Automate 25-min focus + 5-min refresh (Pomodoro)

【Sleep】
Pink noise + rain sounds + 60-min timer for better sleep

【Noise Masking】
White noise softens ambient noise in cafes or libraries

【Meditation & Yoga】
Natural sounds for moments of calm

【Baby Sleep Aid】
Gentle sounds support peaceful sleep

■ Sound Library

▼ Natural Sounds Collaboration Collection
Spring in Sakura, tea fields and streams of Sasama, Lake Toya, Lake Hinuma shoreline...
Professional binaural recordings of Japan's authentic soundscapes
More sounds coming soon

▼ Complete Color Noise Collection
White noise, pink noise, brown noise,
gray noise, violet noise, blue noise
*Popular choices for focus and sleep

■ Refined Design

Beautiful, intuitive interface that's easy to use.
Carefully selected photos that capture the essence of each sound.
A calming experience every time you use it.

■ Download Now

Focus. Relaxation. Sleep.
Everything you need, right in your hands.

■ Go Premium with Free Trial for Even More Freedom

- Ad-free experience
- Add your own sounds (WAV/MP3/AAC supported)
  *Compatible with audio files (DRM-free) in iCloud Drive or Files app

Cancel anytime in Settings.
Subscription auto-renews after free trial ends.
Pricing available in-app.

## Key features

- Mix multiple sounds freely
- Customizable playlists with durations
- Professional binaural recordings
- Dynamic visualizers
- Offline playback
- Pomodoro timer
- Sleep timer

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Premium 1 Month | $0.49 | per month |


## Recent user reviews (3 of 3)

All indexed reviews: https://appshunter.io/ios/app/mugen-sound/id6748948810/reviews.md

### 5/5 — 勉強に、睡眠導入に...

*2025-12-27*

無限時計やTracerなどと同じ開発者さんです。
素晴らしいアプリです。
サウンドを再生しながら宿題をやったり映像編集をしたり...
停止タイマーを設定して睡眠導入にも活用してみました。
どのサウンドも高音質で録音されており、リラックスして過ごすことができます。

無限時計と連携できればもっと良いと思いました。
(サウンドを流しながら無限時計開けばいいですが)

**Developer response:** レビューありがとうございます。 無限時計やTracerに続き、最新作の「無限サウンド」も早速手に取っていただき、本当にありがとうございます！ こうして複数のアプリをご愛用いただいていること、開発者として大変光栄に感じております。

「無限時計と連携できれば」というご指摘、まさに当方が現在感じている課題そのものです。 無限サウンドはまだ生まれたばかりの若いアプリということもあり、無限時計と比較すると、今のところ「置きアプリ」としての画面の魅力がまだ少し弱いかなと認識しております。

今後は、ごんぎつね2006様がサウンドを流しながら思わず机に飾りたくなるようなアプリを目指して、画面表示の強化や、ご提案いただいた無限時計との連携機能も含めて、しっかりと検討を進めてまいります。

今後もお使いいただく中で、ご要望やお気づきの点がございましたら、いつでもお気軽にお教えください。 このたびは、開発の指針となる貴重なレビューをありがとうございました。 今後とも無限サウンドの末永いご愛顧をよろしくお願いいたします。

### 5/5 — 勉強用に丁度いい！

*2025-12-17*

家で勉強するときにきける環境音のアプリがないかなと思って調べていたらこのアプリが1番音が良いなと思いました。時報があるので勉強に集中している時も分かりやすくてすごく良いです！😊

**Developer response:** レビューありがとうございます。 数あるアプリの中から「1番音が良い」とご評価いただき、駆け出しの環境音アプリとしてこれほど光栄なことはございません。
当アプリのサウンドは、音源を提供いただいているサウンドデザイナー様と入念な調整を行い、iOSアプリとして表現できるクオリティの限界を目指して開発いたしました。 その「音」へのこだわりが、アリサ0765様の勉強の集中にお役に立てていると伺い、強い手応えを感じております。
今後も、勉強や作業の良きパートナーとして長くお使いいただけるよう、定期的に新作サウンドを追加してまいりますので、ぜひご期待ください。
もし何かお気づきの点がございましたら、いつでもアプリ内サポートメールよりお声がけください。 このたびは、貴重なレビューをありがとうございました。 今後とも無限サウンドの末永いご愛顧をよろしくお願いいたします。

### 5/5 — おすすめです

*2025-12-16*

ブラウンノイズアプリを探していました。
いろんなアプリを試しましたがこのアプリが一番ちゃんとしてますw
広告は無いのかな？ありがとうございます。
プレイリストでいろんなノイズを切り替えるのに合わせて科目を変えるのが気に入りました。
毎日10時間は使ってます　記録が残ると嬉しいな

**Developer response:** レビューありがとうございます。 数ある中から「一番ちゃんとしてる」とご評価いただき、開発者としてこれほど光栄なことはございません。

毎日10時間もご活用いただいているとのこと、生活の一部としてそこまで深く信頼していただけている点に、開発者として強い責任とやりがいを感じております。 仰る通り、それだけの時間を積み重ねた「記録」が残れば、学習のモチベーション維持に大きく役立ちそうですね！ このアイデアは、今後のアップデートにおける重要な機能候補として、前向きに検討させていただきます。

これからも斉藤がんばれ様の集中を支えるパートナーであり続けられるよう、安定性を第一に開発を続けてまいります。 このたびは、開発の励みになるレビューをありがとうございました。 今後とも無限サウンドの末永いご愛顧をよろしくお願いいたします。

## Frequently asked questions about Mugen Sound

### What is Mugen Sound?

Mugen Sound is an ambient sound app designed to help users focus, sleep, and mask noise. It allows you to mix natural sounds with color noise to create personalized soundscapes and offers features like custom timers and binaural recordings.

### Does Mugen Sound have ads?

Yes, Mugen Sound contains advertisements. As a free app with in-app purchases, advertisements are part of the user experience.

### Can I use Mugen Sound offline?

Yes, Mugen Sound supports offline playback. This means you can enjoy your created soundscapes even without an internet connection.

### What kind of sounds can I mix in Mugen Sound?

You can mix curated natural sounds, such as ocean waves and forest sounds, with six types of color noise, including white, pink, and brown noise.

### How does Mugen Sound help with focus?

Mugen Sound can be used for focus by creating custom soundscapes with specific durations, such as the Pomodoro Technique's 25-minute focus intervals. The app also includes a Pomodoro timer with interval notifications.

### Is Mugen Sound suitable for babies?

Yes, Mugen Sound is suitable as a baby sleep aid. Gentle sounds and customizable timers can support peaceful sleep for infants.

### What devices support Mugen Sound?

Mugen Sound is supported on iPhone and iPad devices. It is rated for ages 4 and up.

### How often is Mugen Sound updated?

The latest version of Mugen Sound is 1.30.1, last updated on July 7, 2026. More sounds are expected to be added in future updates.

## Version history (last 5 releases)

### 1.30.1 — 2026-07-07

This update improves in-app security.

【Security Improvements】
We strengthened how information is protected inside the app, helping you continue to enjoy Mugen Sound with greater peace of mind.

We will keep improving Mugen Sound so it remains a safe and comfortable sound experience. If you notice anything, please contact us through in-app support.

### 1.30 — 2026-06-26

Mugen Sound now supports 12 languages. The app interface and sound information have been updated so more users can enjoy the app comfortably in their own language.

【12-Language Support】
Supported languages: Japanese, English, Simplified Chinese, Traditional Chinese, Korean, French, German, Spanish, Portuguese (Brazil), Italian, Indonesian, and Vietnamese.

The experience has expanded beyond Japanese and English, making sound names, descriptions, settings, and related screens easier to understand across supported language environments. It is now easier to choose the right soundscape for focus, sleep, or relaxation.

This update also improves the stability of sound information syncing and display. If you notice anything, please contact us through in-app support.

### 1.29 — 2026-06-25

This update refreshes how sound images are managed, making the app feel lighter and more responsive across the experience.

【Improved Image Handling】
As the sound library has grown, image loading and management have become increasingly important. This update improves the way images are handled for the sound list, playlists, playback screens, and related artwork, helping the app stay smooth whether you use a few favorite sounds or explore a larger library.

We will continue refining Mugen Sound so it stays comfortable to use every day. If you notice anything, please contact us through in-app support.

### 1.28.3 — 2026-05-15

This update includes small internal refinements to make the app feel smoother in everyday use.


Some behind-the-scenes behavior has been adjusted so the app works more naturally during regular use.

We will continue refining the experience. If you notice anything, please contact us through in-app support.

### 1.28.2 — 2026-04-21

Background playback is now more reliable than ever.

Playback Continuity
Switching away from the app and coming back no longer interrupts your session. Your sound keeps flowing exactly where you left it, even during long listening sessions.

Under-the-Hood Improvements
We've rebuilt core internal systems for greater stability across the board.

Enjoying Mugen Sound? We'd love to hear from you — drop us a line through the in-app support email.

## Apps similar to Mugen Sound

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Ikh Nayd Fitness](https://appshunter.io/ios/app/ikh-nayd-fitness/id6738070026) | — | Free | Health & Fitness |
| [95 Fitness: Training Readiness](https://appshunter.io/ios/app/95-fitness-training-readiness/id6760660209) | 5.0 (2) | Free | Health & Fitness |
| [Advaita 222 Self Inquiry](https://appshunter.io/ios/app/advaita-222-self-inquiry/id6772172736) | — | Free | Health & Fitness |
| [LightHeart: Inner Peace Diary](https://appshunter.io/ios/app/lightheart-inner-peace-diary/id6760962216) | — | Free | Health & Fitness |
| [Sip - Dynamic Hydration](https://appshunter.io/ios/app/sip-dynamic-hydration/id6764423318) | — | Free | Health & Fitness |
| [Pure Ambience – Sleep & Focus](https://appshunter.io/ios/app/pure-ambience-sleep-and-focus/id6755858513) | — | Free | Health & Fitness |

## More apps by Koichiro Kamada

- [Mugen Clock](https://appshunter.io/ios/app/mugen-clock/id1064833509)
- [Clipboard Cleaner - Plain Text](https://appshunter.io/ios/app/clipboard-cleaner-plain-text/id1068024189)
- [Tracer - Easy Location Logger](https://appshunter.io/ios/app/tracer-easy-location-logger/id1136146951)
- [Mugen Camera Non-Stop Cam](https://appshunter.io/ios/app/mugen-camera-non-stop-cam/id1142214008)
- [Mugen Player](https://appshunter.io/ios/app/mugen-player/id1265142965)
- [Zero Camera](https://appshunter.io/ios/app/zero-camera/id1449814538)

All apps by Koichiro Kamada: https://appshunter.io/developer/476534292

---

*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 2026-08-24.*