# Sleep application — 【The Strongest Sleeping App】

> Sleep induction app using binaural beats and flicker noise for faster sleep. (iPhone/iPad app by koikoi.biz.)

- Source: https://appshunter.io/ios/app/sleep-application/id473917761 (this page in markdown: same URL + `.md`)
- Developer: [koikoi.biz](https://appshunter.io/developer/444917150)
- Category: Health & Fitness, Medical
- Price: $0.99
- Rating: 5.00/5 from 4 App Store ratings · 33 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 61 MB
- Languages: American English, Japanese
- Released: 2011-10-25
- Data updated: 2026-09-09
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/sleep-application/id473917761/reviews.md

## What is Sleep application?

--- The Strongest Sleep Induction App ---
 You can sleep quickly just by listening when you go to bed. We ranked No. 1 in Japan (iPhone and iPad).

●Thank you very much!
#1 Top paid app for the iPhone in Japan 
#1 Top paid app for the iPad in Japan 
#9 App Store BEST OF 2012 in Japan
#3 in 2013
#4 in 2014
#3 in 2015
#13 in 2016
#8 in 2017

=====================================
Reviews from users 
*The following contents are translations of reviews posted by Japanese users. 
=====================================

■ This is the one!    Version 3.5  Sept. 15, 2012
My level of concentration has increased!  I have better memory too!  Now I can sleep well at night!

■ Great!! 
In studying or at work, I always use this app.  I am hooked on it!

■ I can't live without this app! 
No need to count sheep with this app!  I'm out like a light.

■ My insomnia is gone!!! 
I guess everyone has different results but this app has sure worked to cure my insomnia!

■ Someone with insomnia
I had a slight case of insomnia but now all that is gone after listening to this app.

■Explanation of this App
1. When a person hears two different frequencies in their ears, the difference of those frequencies will appear in the brain as one frequency.  In this app that principle is used and your brain will be in a state as when you are sleeping.
2. The sound of "Flicker Noise" is known to help balance the autonomic nervous system as it enters the hypothalamus of the brain, which helps relieve pressure on the sympathetic nervous system.
Through a combination of the two above methods you will be lead directly and indirectly into a deep sleep.
※ The sound of "Flicker Noise" is the sound parameters of the background environmental sound.

How to Use
1. Start the app.
2. Choose your favorite background music.

Also, for more effective sounds through the change in settings.
Results (sleep / relaxation/ concentration, memory)

- The effects of concentrating
The mode is for increasing brain activity and raising your level of concentration before doing sports.
- The effects of memory
This mode will take you a deeper level than the relaxation mode.  This mode is recommended for studying or raising your level of memory.

※ The sound which can help each person is slightly different so we suggest that you try different settings to find the sound that best works for you.
※There is no guarantee that the effect will work on everyone.


○This application uses a binaural beat technology, which has been scientifically proven effective.
However this method uses only 3db, so based on how sensitive the user is, there may be a gap in benefits received.
Even if you did not get results your first time, keep using it every day. You should slowly see better results.

○How to use this application effectively
・Close your eyes, relax and assume a position laying down.
・This application needs to use many low and high frequencies so use high quality headphones not cheap 100 yen ones.
・If your ears start to hurt, please turn down the volume until until the music is barely audible.

○ Our company has an app "3D Eyesight Recovery" to help restore eyesight using stereogram.
Stereogram uses the eyesocket muscles resulting in effectively stretching your eyes and it is said that when used before sleeping this app helps you to sleep more soundly.  Why not try this wonderful app?
※ You need a special way to see Stereogram, so a little practice is required.  The instructions for this are in the app.

※Binaural Beat is a technology which controls the brain waves.
For anyone with one of the following problems below, please consult your Physician.
・ For Those with Epilepsy
・ For Those with Heart Problems (especially those with pacemakers)
Do not us this app when driving or doing other dangerous work.

## Key features

- Binaural beat technology
- Flicker Noise sound
- Sleep induction
- Improved concentration
- Enhanced memory
- Customizable sound settings

## Recent user reviews (10 of 33)

All indexed reviews: https://appshunter.io/ios/app/sleep-application/id473917761/reviews.md

### 5/5 — 良い！

*2017-08-05*

めっちゃ寝れます！眠れないときはいつも使ってます！
不眠の方は是非試してみて下さい！
雨音がオススメです。

### 5/5 — 最高過ぎる！！

*2017-07-19*

ホントに最高すぎます！
寝る前や勉強中に聞いてます。
これあるとなしじゃ全然違います！！おすすめは 小川２ と 昼下がりの夢 です！！是非ダウンロードして下さい！後悔はしません！！高１女子

### 5/5 — 大変満足！

*2017-07-08*

眠れず悩んでいた日々を忘れてしまいました！今は、必需アプリです！

### 5/5 — とてもいい！

*2017-07-07*

すぐに眠りにつけます。初めて使った時はびっくりしました！

### 5/5 — 毎日使ってる

*2017-07-03*

テスト勉強
寝る前

基本使ってる！
有料アプリ意を決して買ってよかった

### 5/5 — よく眠れる

*2017-07-02*

お世辞抜きで素晴らしいアプリ。
買ってよかった。

### 5/5 — good

*2017-06-25*

何故かはわからないけれど本当にすごくめちゃくちゃ寝れます！
お金を払う価値あります

### 5/5 — 眠れます

*2017-06-20*

睡眠薬を処方してもらっても寝付けず、困っていたのですがこちらのアプリを併用したら、リラックスしてよく眠れました。これで120円、やすいです。

### 5/5 — いいです。

*2017-06-01*

睡眠時、勉強時と大活躍してます！

### 5/5 — すごくいいです。

*2017-06-01*

これはものすごくいいです。
なんか小難しいことは抜きにして寝れます。

## Frequently asked questions about Sleep application

### How does Sleep application help users sleep?

Sleep application uses binaural beat technology, where different frequencies played in each ear create a third frequency in the brain, inducing a sleep-like state. It also incorporates 'Flicker Noise' to help balance the autonomic nervous system.

### What are the benefits of using Sleep application besides sleep?

Users have reported increased concentration and improved memory after using the app. Specific modes are designed to boost brain activity for sports or enhance memory for studying.

### Does Sleep application work for everyone?

The app states there is no guarantee that the effect will work on everyone, as the ideal sound can differ per person. It recommends trying different settings and using the app daily for better results.

### What devices is Sleep application compatible with?

Sleep application is available for iPhone, iPad, and iPod. It requires high-quality headphones for optimal effectiveness due to its use of various frequencies.

### How often is Sleep application updated?

The app was last updated on September 13, 2021, to version 3.16. While updates may not be frequent, the core functionality remains focused on sleep induction and cognitive enhancement.

### What is the price of Sleep application?

Sleep application is a paid app priced at $0.99. It was a #1 Top Paid app in Japan for both iPhone and iPad.

### Does Sleep application have ads?

No, Sleep application does not contain advertisements. It is a paid application that focuses on providing a seamless user experience without interruptions.

### What is the age rating for Sleep application?

Sleep application has an age rating of 4+. This indicates it is suitable for users aged 4 and above, with no mature content.

## Version history (last 5 releases)

### 3.16 — 2021-09-13

- Fixed a minor bug.

### 3.15 — 2020-11-06

- Supported iOS14.
- Added BGMs.
- Added the favorite function.

### 3.11 — 2018-08-30

- Supported iPhoneX
- Added Sounds

### 3.10.1 — 2017-04-25

- When you are inserting an earphone with an alarm clock, you can set whether to emit an alarm sound from an earphone or a speaker.
- Fixed a bug that the application might fall after using the vibes in the alarm clock.
- Other, bugs have been corrected.

### 3.9.10 — 2017-04-18

- Supported iOS 10.
- Added morning images.
- The vibration sensing timer was corrected.
- Fixed to display correctly even when not set to 24 hour notation by iPhone time setting.
- Added 4 songs.
- Added a vibrate in addition to the alarm clock on the iPhone.

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| --- | --- | --- | --- |
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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 2026-09-09.*