Harmonium is a sound therapy application that makes the rhythm of the moon and the sea permeate into you.

Harmonium creates healing sounds from the moon's astronomical location(moon phase and distance between the earth and the moon) and weather forecast (atmospheric pressure and tide level).

This healing sound consists of the sound of waves, the sounds of creatures, the sounds of rain and thunder, and a piano tuned to 432 Hz.

In addition, we refer to the brain science study that the relaxation of the mind and body will increase when the brain wave of a person becomes 8 to 13 Hz. Harmonium reproduces the phenomenon called Brainstem Frequency Following Response(FFR) to obtain the brain waves of this frequency.

Harmonium makes use of two types of FFR guiding sounds, 432Hz and 528Hz, according to the position of the moon and, while aligning with the tide level in real-time, changes the frequencies of the left and right sounds like the ebb and flow of the tide, guiding the brainwaves to 7.83Hz, a little lower than 8Hz.

Harmonium evokes a sense that perceive the rhythm of nature.

Harmonium has three channels.

1. Concentration
Play only the ocean wave sounds.(45 min)
There are 24 ocean sound files in Harmoniums.

2. Relax
Added FFR guidance sound to the ocean wave sounds.(30 min)

3. Sleep
Ocean wave sounds,Creatures living around the ocean, Weather sounds of rain and thunder, Felt piano sound, and FFR guidance sound.(60 min)
When the moon leaves the earth, FFR guidance sound is 528 Hz, and when the moon approaches the earth, it is 432 Hz.
During the tide rise, add the target EEG frequency to the FFR guidance sound. Subtract when the tide is falling.

At the moon moves away from the earth, the tide is rising
Left ear:528Hz + 7.83Hz = 535.83Hz
Right ear:528Hz + 0 = 528Hz
535.83Hz - 528Hz = 7.83Hz

Harmonium uses special sounds known as Frequency Following Response sound(A similar sound is binaural beats).Therefore, please do not use this app in the following cases.

If you suffer from epileptic seizures.
If you suffer from heart disease.
If you use a pacemaker.
If you are driving a car or ship,bike,bicycle.
If you operating a machine.
If you are less than 12 years old.

If you feel physical or mental discomfort, please discontinue use immediately.

The tide level information is a forecast value(astronomical tide).
it differs from the tide level actually observed(measured tide level).
Do not use this application for voyage, diving, fishing.

Subscription pricing and terms
Harmonium can be used free of charge for 3 days after first installation.
If you use Harmonium continuously, please purchase a subscription with a 3-day free trial.

After purchasing a subscription, if you cancel at least 24 hours before your free trial ends, you will not be charged.
After purchasing a subscription, if you do not cancel and the 3-day free trial period expires, you will automatically start a paid subscription.

You will be charged to your iTunes account when you purchase a subscription.

You can turn off auto-renew subscription at any time in your Apple ID account settings.
If the purchase procedure is completed, refunds can not be made even if you stop the subscription.

You can use the free trial only for the first time.
You cannot use the free trial after the second time.

Terms and Conditions / Privacy Policy
Please read about our terms and conditions and privacy policy.

What’s New

Version 0.1.5

- Fixed - Sound becomes inaudible After viewing an alarm or timer notification.

Ratings and Reviews

4.1 out of 5
8 Ratings

8 Ratings

karen_t73 ,


Yesterday I heard only the sound of waves and the piano, but today the wolf and the birds were singing.
I want to be able to freely mix animals and piano sounds.

Developer Response ,

Thank you for your feedback.
Your suggestion is really attractive.
We will research how to achieve that function.

dream_on-dreamer ,

Beautiful Sounds

This is a lullaby by Mother Earth.
I had some nostalgic dreams last night.
The pillow was wet in the morning.
Keep up the great work guys!

Developer Response ,

Thank you for a touching review.
I'm glad you liked it.

ManOnTheMoon🌕 ,

Feel good ❤️

Nice soundscape music.
I was looking for an app like this.

Developer Response ,

Thank you.
I'm glad you liked it.

App Privacy

The developer, Masaru Suzuki, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Location
  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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