Sleep application
睡眠アプリ
Sleep application is #40 in Health & Fitness Paid in Japan and charting in 2 of 24 countries we track.
Updated 27 Sep 2026 · rankings refresh through the day
Developerkoikoi.biz
CategoryHealth & Fitness
Price150 JPY
Released
Rating★ 4.8 (9.2k)
Version3.16
Age rating4+
First seen by us
25 Sep 2026
25 Sep 2026Installs (est.)500k+ worldwide
Rating
4.8 ★
9.2k ratings
Measured
Best rank now
#40
Health & Fitness PaidMeasured
Sleep application on the App Store
App details
App ID
473917761
Publisher
koikoi.biz
Content rating
4+
Sleep application downloads
Worldwide, per day, and installs to date. The band is open; the exact number is free with an account.
How this is calculated
Apple publishes no download counts. iPhone downloads come from chart positions and daily rating growth per country, calibrated on Google Play install counts; lifetime installs from ratings worldwide × installs per rating. Confidence is the chance the real number is within half to double ours.
Where Sleep application's downloads come from Modelled
Last 30 days: organic search, browsing the store, features and paid ads.
Active users
All platforms, worldwide. Free with an account.
Stickiness (DAU / MAU)
how many monthly users open it on a given day
How this is calculated
Monthly users come from lifetime installs across every store, fitted on monthly active user figures companies publish; daily users = monthly × the typical daily/monthly ratio for the category. Confidence is the chance the real number is within half to double ours.
Where it ranks now
Every top chart it appears in across 24 countries.
| Country | Charts | Rank |
|---|---|---|
| Japan | Health & FitnessPaid | #40 |
 Taiwan | Health & FitnessPaid | #129 |
Apps near Sleep application on the chart
Health & Fitness Paid, around #40.
Ratings
App Store, worldwide.
Rating
4.8 ★
9.2k ratings
Measured
Ratings
9.2k
Measured
About 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
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
Latest updates
3.16
- Fixed a minor bug.
