Mugen Sound
Your Ultimate Soundscape.
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Ultimate focus at your fingertips. Mix nature sounds & color noise freely. Pomodoro and sleep timers in one app. Pro binaural Japanese soundscapes for deep immersion.
■ 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.
more 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.
1.28.2 Apr 21
Small polish to the settings screen.
Startup Screen Picker Fix
We've fixed an issue in Settings where the "Screen to open at launch" picker wasn't always showing the current selection. Tapping a choice now updates the picker immediately, making the setting feel as intuitive as it should.
How does it feel? Drop us a line through the in-app support email — we'd love to hear from you.
1.28.1 Apr 20
From the very first moment you open the app, Mugen Sound now welcomes you into its world of immersive ambient audio!
A Warm Welcome for New Users
We've crafted a beautiful onboarding experience that introduces you to the app through stunning photography from our field recording locations across Japan. You can even preview real sounds right from the welcome screen — hear what makes Mugen Sound special before you dive in.
Getting Started, Made Easy
Discover recommended sounds, learn how to use the sleep timer, and find the perfect soundscape for focus, relaxation, or sleep — all guided step by step from the moment you arrive.
More sounds are on the way. Have thoughts or suggestions? Drop us a line through in-app support — we'd love to hear from you.
1.28 Apr 9
Improved stability for the full-screen player and settings screens.
Full-Screen Player Stability
On iOS 26.4 / iPadOS 26.4 and later, certain actions within the full-screen player could cause playback to stop unexpectedly. This has been resolved — your sound keeps playing without interruption.
Settings Text Display
Fixed an issue where some text in settings screens could be truncated and unreadable. All labels now display in full.
Noticed something or have a suggestion? Reach out anytime through in-app support — we'd love to hear from you.
1.27.2 Apr 4
We've refined the color palette across the app.
Improved Dark Mode Visibility
Some buttons and icons were blending into the background in Dark Mode. We've adjusted the tones for better contrast and readability.
Accent Color Fix
In certain environments, buttons and tabs could appear in the system's default blue instead of Mugen Sound's signature deep navy. This has been corrected so the app's true colors come through consistently.
We're always working to make Mugen Sound better. Got feedback or ideas? Drop us a line through the in-app support — we'd love to hear from you.
1.27.1 Mar 26
Mugen Sound now works beautifully with a keyboard and mouse — making it a joy to use on iPad with accessories and on Mac!
Menu Bar Playback Controls
A brand-new "Playback" menu sits right in the Mac menu bar. Stop the current sound, skip to the next one, or adjust the volume — all without switching back to the app window.
Full Keyboard Shortcut Support
Space to play/pause. ⌘. to stop. ⌘→ to skip ahead. ⌘↑↓ for volume. ⌘1/2/3 to switch screens. With an external keyboard, every essential action is just a keystroke away. A handy shortcut guide has been added to Settings, too.
Pointer Hover Feedback
On iPad, buttons and cards now respond visually when you hover over them with a mouse or trackpad. It's easy to see what's tappable, making navigation feel smooth and natural.
We're always refining Mugen Sound to feel great on every screen you use it on. Have thoughts or ideas? We'd love to hear them — reach out through the in-app support anytime.
1.27 Mar 23
Mugen Sound now runs natively on iPad! We've put a lot of care into making the most of that bigger screen, and we're excited to share the result.
A Sidebar That Puts Everything at Your Fingertips
On iPad, a sidebar stays visible on the left side of the screen. Jump directly to any sound category, or tap a playlist name to start fullscreen playback instantly — no more switching between tabs.
Sound Cards That Fill the Screen
The sound grid automatically expands to three or more columns on iPad, so you can see far more cards at a glance. Less scrolling, faster discovery. The playlist screen works the same way, with cards lining up side by side for a much better overview.
The Fullscreen Player, Tailored for iPad
The progress ring, background imagery, clock display, and playback controls — every element has been redesigned for iPad's screen. The clock is larger and easier to read, and the layout centers everything with generous spacing for a calm, focused feel.
Works with Slide Over and Split View
Mugen Sound adapts to iPad multitasking. Resize the window and the layout shifts automatically between sidebar and tab bar — seamlessly.
Smoother Playlist Reordering
We've reworked how you reorder playlists to make it more intuitive.
If you have an iPad, give it a spin on the big screen — we think you'll really enjoy it. We're always working to make Mugen Sound better. Drop us a line through the in-app support if you have any thoughts or ideas!
1.26 Mar 18
The playlist screen has been completely redesigned and rebuilt from the ground up.
- A stunning new card-based design showcasing sound imagery for each playlist
- Tap a playlist to launch the fullscreen player instantly for a smoother listening experience
- Drag and drop to reorder your playlists intuitively
- Edit your playlists entirely within the fullscreen player — add, remove, reorder, and adjust playback durations all in one place
We're proud of how this turned out and hope you love it!
1.25 Mar 11
Refined multilingual support across the app.
[Settings & Alerts — Better Localization]
Chime interval labels and sound-related alert messages now correctly reflect your device language. Previously, certain conditional text in settings and error messages could appear untranslated.
Got ideas for making things better? We're all ears — drop us a note through the in-app support email.
1.24 Mar 3
A new sound, "Snowy Night in Hidden Ibaraki," has joined the collection!
[Snowy Night in Hidden Ibaraki]
Deep in the forests of Hitachiomiya, Ibaraki Prefecture, at 11 PM. Falling snow absorbs every sound around it, leaving the world in near-perfect silence. Listen closely and you'll barely hear the faintest whisper of snowflakes settling on branches — delicate, endless, like nature's own white noise. This level of stillness is unlike anything else in the collection. Perfect for deep meditation or drifting off to sleep.
[Content Updates Now Reach You Faster]
We've improved how the app communicates with our servers, so new sounds and updates show up in your library more quickly after they're released.
More sounds are in the works — we'd love to hear what you think. Drop us a line through the support email in the app!
1.23 Feb 27
Every background image in the app has been carefully reviewed and upgraded to higher resolution — the world of Mugen Sound just got a whole lot more vivid!
**High-Resolution Background Images**
All landscape photographs tied to each sound have been replaced with significantly higher-resolution versions. Each image was hand-picked to faithfully capture the atmosphere and colors of the recording location, ensuring the visual experience matches the sound. Whether you're browsing the grid, using the standard player, or immersed in full-screen mode, you'll notice richer detail and deeper depth in every scene.
**Redesigned Full-Screen Scroll Animation**
The background scroll animation in full-screen playback has been rebuilt from the ground up to take full advantage of wider, higher-quality images. Movement now begins sooner after pressing play, flows at a natural pace, and reverses smoothly at the edges — no more wondering if the image is actually moving. The difference between speed settings (Slow, Standard, Fast) is also more pronounced.
**Smarter Memory Management**
A new image handling system automatically adjusts resolution based on screen size, so high-resolution images look stunning without taxing your device. Memory is released proactively when needed, keeping things smooth alongside your other apps.
We're committed to bringing you ever-more immersive soundscapes — "Real places. Real microphones. Real sound." If you have thoughts, suggestions, or a favorite new image, we'd love to hear about it through the support email in the app.
1.22 Feb 22
The main screen has been completely reimagined with a stunning new grid layout that makes discovering your perfect ambient sound more visual and intuitive than ever!
**Collection-Style Grid Layout**
The sound library now features a beautiful card-based grid with two columns, each showcasing the sound's landscape photography front and center. You can instantly see what each sound is about — no more scrolling through a plain list. Cards gently fade in as you scroll, creating a browsing experience that feels as relaxing as the sounds themselves.
**Seamless Zoom Transitions**
Tap a sound card and watch it smoothly expand into the full-screen player. This zoom transition keeps you oriented and makes switching between browsing and listening feel natural and fluid.
**Auto-Minimizing Tab Bar**
Scroll down through the sound collection and the tab bar quietly shrinks out of the way, giving you more room to explore. Scroll back up and it reappears — simple and unobtrusive.
**Improved Playlist View**
Playlist thumbnails are now larger and horizontally scrollable when there are many sounds. The playback order text is always displayed at a comfortable, readable size regardless of how many items are in the playlist.
We're working on expanding the sound library and making Mugen Sound even better. Have feedback or a sound you'd love to hear? Drop us a line through the support email in the app — we'd love to hear from you.
1.21 Feb 17
We've completely rebuilt how sound data is managed behind the scenes, making the app more flexible and efficient than ever!
Cloud-Based Sound Management
All sound information is now fetched from our cloud server instead of being bundled within the app. The app automatically checks for updates at launch and keeps network usage to a minimum when nothing has changed. While things look the same on the surface, this is a major under-the-hood overhaul that we built from the ground up.
New Sounds Without App Updates
The biggest benefit: new ambient sounds can now appear in the app without requiring an update from the App Store. When we add a sound to our server, it shows up automatically the next time you open the app — meaning fresh soundscapes reach you faster than ever.
Improved Offline Guidance
We've redesigned the screen that appears when an internet connection is needed for the initial setup, providing clear and friendly instructions so you know exactly what to do.
We're planning to ramp up the pace of new sound additions going forward. Have a request like "I'd love to hear the sound of..."? Drop us a line through the support email in the app — we'd love to hear from you.
1.19 Feb 10
We've thoroughly redesigned our UI and deeply studied Apple's latest design language, Liquid Glass, to bring you a major visual update!
■ Full Liquid Glass Adoption
The entire app has been refreshed to embrace iOS 26's new Liquid Glass design language. Navigation bars and toolbars now blend naturally with the glass aesthetic. All custom color controls have been replaced with standard OS behaviors, resulting in a design that feels truly native and cohesive.
■ Unified Accent Color
A refined deep navy accent color now runs consistently throughout the app. Buttons, toggles, sliders, and all interactive elements share the same polished look, delivering a more sophisticated visual experience.
■ Refined Toolbar Buttons
Action buttons like Cancel, Save, and Close have been updated from text labels to clean icons across all screens, giving the app a more modern and intuitive feel.
■ Improved Sound List Display
The gradient backgrounds on sound list rows have been fine-tuned so each sound's signature color blends more naturally into the interface.
■ Redesigned Usage Rules Screen
The sound usage rules screen has been completely rebuilt with a structured layout that matches the rest of the settings experience, organized into clear sections for easier reading.
We're committed to making your sound experience even better. Have ideas or feedback? We'd love to hear from you via the support email in the app.
1.18 Feb 9
We've completely revamped our sound delivery servers!
■ Faster Downloads
The way sound files reach your device has been rebuilt from the ground up. A network of servers distributed around the world now automatically picks the one closest to you, significantly reducing download wait times. Users outside Japan will notice an especially dramatic improvement.
■ More Reliable Downloads
The new servers intelligently select the best route based on your network conditions, making interrupted or stalled downloads a thing of the past.
We hope you enjoy the smoother experience. Have thoughts or feedback? We'd love to hear from you via the support email in the app.
1.17 Feb 7
The fullscreen player just got even more beautiful!
■ Scrolling Background Animation
During fullscreen playback, the background image now gently scrolls, creating an immersive experience as if you were really there. Choose your preferred scroll speed — Slow, Standard, or Fast — or turn it off entirely.
■ Number Animation for Progress Ring
You can now add animation effects when the time display numbers change. Choose from Slide, Fade, or None in the "Number Animation" setting to match your style.
We'd love to hear what you think of the new fullscreen player. Feel free to share your thoughts via the support email in the app.
1.16 Feb 6
【New Sound "Ibaraki's Hidden Gem: Morning Thaw" Added】
Thank you for using Mugen Sound. This update introduces a new soundscape that captures the serenity and awakening of a winter morning forest.
[Ibaraki's Hidden Gem: Morning Thaw] I have added a new sound recorded in the forests of Hitachi-Omiya, Ibaraki, at 7:00 AM. Listen to the rhythmic sound of melting snow dripping from branches in the morning light, gradually joined by the calls of crows and the chirping of wild birds. This soundscape vividly conveys the moment the entire forest slowly wakes up. It is perfect for a quiet morning routine, reading, or stretching. Please enjoy this gentle start to your day.
If you have any feedback on the new sound or requests for the app, please feel free to contact me at any time via the in-app support email. I always look forward to hearing from you.
1.15 Feb 5
【Custom Timing for Time Signals】
Thank you for using Mugen Sound. This update introduces a new feature that gives you complete control over when time signal announcements are played.
[Custom Timing Schedules] In addition to the standard fixed intervals (every 15, 30, or 60 minutes), you can now create your own personalized schedule by freely combining any timing from 0 to 59 minutes past the hour. You can save multiple custom patterns and switch between them easily to suit your workflow or daily routine. (Note: This is a Premium feature.)
[Improved Stability] I have optimized internal processing during background playback to ensure smoother and more stable performance, even during long sessions.
If you have any feedback or requests regarding the new features or sounds, please feel free to contact me at any time via the in-app support email. I always look forward to hearing from you.
1.14 Feb 4
【Major Upgrades to Voice Announcements】
Thank you for using Mugen Sound. This update brings significant improvements to the popular "Current Time" and "Elapsed Time" announcement features.
[High-Quality Voice Selection] You can now freely select from the high-quality voice models built into iOS. This allows for much more natural, human-like speech. You can customize the experience to your liking, for example, by choosing a male voice for time announcements and a female voice for elapsed time.
[Expanded Phrasing Variations] I have greatly expanded the variety of phrases used for announcements (e.g., "It is now [time]", "Just turned [time]"). You can select multiple variations to be played at random. This prevents the announcements from becoming repetitive and ensures a more natural experience.
[Audio Balance Adjustments] To complement the enhanced voice features, I have added controls to adjust the balance with the main soundscape. You can now adjust the "Ducking" level (how much the background sound lowers during announcements) and the master volume of the main sound, ensuring that voice announcements blend naturally with your relaxation.
[Contact Support] If you have any questions about this update or requests for future features, please feel free to contact me at any time via the in-app support email!
1.13 Feb 4
【Full-Screen Player & Design Refresh】
Thank you for using Mugen Sound. This major update introduces a new way to immerse yourself deeply in the world of sound.
[Immersive Full-Screen Playback] I have added a beautiful full-screen playback mode that allows you to dive deeper into your soundscapes. A stunning ring display in the center of the screen allows you to intuitively track progress, such as the time until the next track in a playlist or the remaining time on the sleep timer.
[Customize Your Experience] You can customize the full-screen player to your liking. Adjust the thickness of the rings, font size and weight, visualizer intensity, and drawing area to create a playback screen that is uniquely yours. Intuitive gestures are also supported, allowing you to play/pause, skip to the next sound, or close the screen with simple swipes and taps.
[Redesigned Sound List] Along with the new player, the home screen sound list has been significantly redesigned. Each sound now features a representative background color, making it visually easier to identify and more beautiful to browse.
[We Value Your Feedback] This update involves major improvements to the app's underlying code. While I have tested thoroughly, if you notice any issues or have ideas on how to make the full-screen experience even better, please feel free to contact me at any time via the in-app support email.
1.12 Jan 27
【New Sound "Namie Moonlit Ocean" Added】
Thank you for using Mugen Sound. This update introduces a new soundscape designed to bring you deep peace and a calm mind.
[Namie Moonlit Ocean]
I have added a new sound recorded at the night beach in Namie, Fukushima. The gentle rhythm of the rising tide caressing the sand and the subtle sounds of bubbles dissolving on the rocks deepen the silence. This soothing sound of the moonlit ocean is perfect for deep sleep support, bedtime relaxation, night meditation, or simply calming your breath.
[We Value Your Feedback]
I look forward to hearing your thoughts not only on the app's features but also on the sounds. If you have any requests for new sounds or feedback, please feel free to contact me at any time via the in-app support email.
1.11 Jan 22
【New Healing Sound: Open-Air Onsen】
Thank you for using Mugen Sound. In this update, I have added a new soundscape that focuses deeply on "healing" and "warmth," offering a slightly different atmosphere from the existing lineup.
[New Sound: Yamanashi Open-Air Onsen]
I have added the sound of a secluded open-air bath (Onsen) tucked away in a quiet valley in Yamanashi. The gentle sound of flowing hot water blends with the crisp valley air to create a moment of pure bliss. Experience the unique Japanese comfort of sinking into a warm bath and letting out a sigh of relief. This sound is perfect for washing away daily fatigue and warming your mind and body from within.
[Updates & Support]
I will continue to add new sounds regularly to enrich your daily life. If you have any requests, feedback, or encounter any issues, please feel free to contact me at any time via the in-app support email.
1.10 Jan 14
【New Sound "Namie Ocean Waves" Added】
Thank you for using Mugen Sound. In this first update of the year, I have added a powerful new soundscape perfect for starting fresh with renewed energy.
New Sound: "Namie Ocean Waves" I have added a new sound recorded at the Ukedo Coast in Namie, Fukushima, facing the vast Pacific Ocean. Experience the overwhelming power of nature as heavy swells crash against the shore. The dynamic rhythm, weaving together the deep bass of the ocean and the crisp sound of splashing spray, acts as a natural cleanser. It washes away daily stress and fills you with positive vitality from deep within. This sound is perfect for workouts, boosting your motivation, or when you need a complete mental reset. Experience the heartbeat of the Japanese coast.
New Year's Greetings Happy New Year! I am committed to providing you with more relaxing and energizing sounds to enrich your daily life throughout 2026. Thank you for your continued support.
1.9 Jan 5
【Time Signal Optimization & "Silence" Updates】
Thank you for using Mugen Sound. This update includes optimizations to ensure consistent performance and adjustments to descriptions.
Time Signal Optimization I have optimized the default settings for the Hourly Chime function. This ensures that the chime plays correctly and reliably for all users, regardless of when the app was installed.
"Silence" Description Update I have refined the description for the recently added "Silence" sound to make its usage and benefits clearer.
Season's Greetings Thank you for using Mugen Sound this year. Your support has been invaluable. I look forward to bringing you more improvements in 2026. Have a wonderful New Year!
1.8.1 12/29/2025
【New "Silence" Sound】
Thank you for using Mugen Sound. This update brings a highly requested feature.
New "Silence" Sound Added I have added a new "Silence" option to the sound library. By adding this to your playlist, you can create gaps of silence between tracks. For example, you can play a sound for 10 minutes, have 3 minutes of silence, and then start the next sound. This allows for much more flexible playlist design.
Premium Activation Fix I have resolved an issue where there could be a time lag in activating Premium features depending on network conditions. The process is now more reliable and seamless.
Refined English Descriptions Based on your feedback, I have reviewed and improved the English descriptions throughout the app to ensure they are more natural and accurate.
Season's Greetings Thank you for using Mugen Sound this year. Your support means everything to me. I look forward to bringing you more improvements in 2026. Have a wonderful New Year!
1.8 12/27/2025
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.
more Version 1.28.2 Apr 21
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