# Harmonium - Sound Therapy — Healing-Relax-Sleep > Sound therapy app using moon and weather data for relaxation and sleep. (iPhone/iPad app by Masaru Suzuki.) - Source: https://appshunter.io/ios/app/harmonium-sound-therapy/id1441495836 (this page in markdown: same URL + `.md`) - Developer: [Masaru Suzuki](https://appshunter.io/developer/1214200807) - Category: Health & Fitness, Music - Price: Free with in-app purchases - Rating: 3.78/5 from 9 App Store ratings · 8 written reviews indexed - Age rating: 12+ - Requires: iOS 15.0 · 756 MB - Languages: English, French, German, Japanese - Released: 2019-06-16 - Data updated: 2026-06-01 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/harmonium-sound-therapy/id1441495836/reviews.md ## What is Harmonium? Harmonium is a sound therapy application that makes the rhythm of the moon and the sea permeate into you. ----------- Feature ----------- 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. ----------- Function ----------- 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. Ex. 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 ----------- Notes ----------- 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. https://harmonium.gridsystem.co.jp/hp/terms.html https://harmonium.gridsystem.co.jp/hp/privacy.html ## Key features - Generates healing sounds based on moon phase and weather - Utilizes Frequency Following Response (FFR) for brainwave guidance - Offers channels for Concentration, Relax, and Sleep - Incorporates ocean waves, creature sounds, and rain/thunder - Features piano tuned to 432 Hz - Adjusts sound frequencies based on real-time tide levels ## Pricing and in-app purchases Base price: Free. **Subscriptions** | Subscription | Price | Period | | --- | --- | --- | | One Month Subscription | $0.99 | per month | | 1 Month Subscription | $0.99 | per month | ## Recent user reviews (8 of 8) All indexed reviews: https://appshunter.io/ios/app/harmonium-sound-therapy/id1441495836/reviews.md ### 1/5 — the app expires *2024-12-19* and you cannot use it at all. i barely used it the first day then forgot about it. tried to give it some more time on it, and the “days” had expired. wouldn’t allow me to use the app at all. deleted. bad model. ### 4/5 — Keeps shutting down *2024-10-17, version 0.1.9* App will not open keeps shutting down ### 2/5 — Confused *2020-06-14* I’m confused on how this works. I’m not feeling relaxing when the ocean seems like it’s rough. Not peaceful. **Developer response:** Thank you for your feedback. We are very sorry that you couldn't relax with Harmonium. It may be meaningful to have met on a rough day. Inlakesh! ### 5/5 — Lovely *2019-12-05* 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. Inlakesh! ### 5/5 — Beautiful Sounds *2019-10-28* 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. Inlakesh! ### 5/5 — Feel good ❤️ *2019-10-22* Nice soundscape music. I was looking for an app like this. **Developer response:** Thank you. I'm glad you liked it. Inlakesh! ### 1/5 — Malware !!!! *2019-10-16* This app continues to try to install on my phone after continually deleting do not download you will regret it... had to give one star to review but deserves -5 **Developer response:** Dear Endel Lover, Thank you for sending a valuable review. Your comments regarding the service you received at our store are very important to us. 1) If there are multiple devices using the same AppleID, the app is automatically download. 2) If an error occurs while downloading an app, it cannot be delete from the home screen. In this case, please tap [Settings] > [General] > [iPad Storage] > [Harmoniums] > [Delete App] This app does not have any functions that are disadvantageous to users. Sincerely yours, Masaru Suzuki ### 3/5 — .. *2019-06-18, version 0.0.1* It’s good but it crashes when I hit the ‘relax’ button. ## Frequently asked questions about Harmonium ### What is Harmonium's main purpose? Harmonium is a sound therapy application designed to promote relaxation, improve sleep, and enhance concentration. It achieves this by generating unique healing sounds influenced by astronomical data and weather forecasts. ### How does Harmonium guide brainwaves? Harmonium utilizes Frequency Following Response (FFR) sounds, specifically tuned to 432 Hz and 528 Hz, to guide brainwaves towards a relaxed state of 7.83 Hz. This is done in conjunction with real-time tide level data. ### What types of sounds can I expect in Harmonium? The app features a variety of natural sounds including ocean waves, sounds of sea creatures, rain and thunder, and a piano tuned to 432 Hz. These are combined with FFR guidance sounds. ### Does Harmonium have different modes for various needs? Yes, Harmonium offers three distinct channels: 'Concentration' with ocean wave sounds (45 min), 'Relax' with added FFR guidance (30 min), and 'Sleep' which includes a comprehensive mix of sounds (60 min). ### What are the subscription details for Harmonium? Harmonium offers a 3-day free trial upon installation. Continuous use requires a subscription, with a 1-month plan costing $0.99. Users can cancel within 24 hours of the trial ending to avoid charges. ### Are there any age restrictions or safety warnings for Harmonium? Yes, Harmonium is not recommended for individuals under 12 years old, or those with epileptic seizures, heart disease, or pacemakers. It should not be used while driving or operating machinery. Discontinue use if any discomfort arises. ### How often is Harmonium updated? The latest version of Harmonium is 0.1.10, and it was last updated on October 8, 2025. This indicates regular maintenance and potential feature additions. ### Is Harmonium available on different devices? Harmonium is supported on iPhone, iPad, and iPod devices, making it accessible to a wide range of Apple users interested in its unique sound therapy features. ## Version history (last 5 releases) ### 0.1.10 — 2025-10-08 Updated the UI to display correctly on iPhone 17 series. ### 0.1.9 — 2024-09-18 New iPhone and iOS 18 are now supported. System Requirements Minimum: iOS 15 ### 0.1.8 — 2023-03-08 Changed weather forecast service from DarkSKy to OpenWeather. Compatible with iPhone 14 series. ### 0.1.7 — 2021-10-14 - Fixed - Program error. ### 0.1.6 — 2021-10-03 - Fixed - The channel selection buttons were not displayed in the correct position on some devices. ## Apps similar to Harmonium | App | Rating | Price | Category | | --- | --- | --- | --- | | [ColorSleep: Green, Brown Noise](https://appshunter.io/ios/app/colorsleep-green-brown-noise/id1658257567) | 4.8 (16,831) | Free | Health & Fitness | | [White Noise Deep Sleep Sounds](https://appshunter.io/ios/app/white-noise-deep-sleep-sounds/id1083248251) | 4.8 (203,079) | Free | Health & Fitness | | [Slumber－Calm Stories for Sleep](https://appshunter.io/ios/app/slumbercalm-stories-for-sleep/id1109543953) | 4.7 (26,328) | Free | Health & Fitness | | [Frequency: Healing Sounds](https://appshunter.io/ios/app/frequency-healing-sounds/id684672780) | 4.7 (2,308) | Free | Health & Fitness | | [Sleepi: Sounds to Sleep Well](https://appshunter.io/ios/app/sleepi-sounds-to-sleep-well/id1507018513) | 4.7 (378) | Free | Health & Fitness | | [Relaxing Sounds, Sleep Easy](https://appshunter.io/ios/app/relaxing-sounds-sleep-easy/id502222888) | 4.7 (15,711) | Free | Health & Fitness | ## More apps by Masaru Suzuki - [Volonte](https://appshunter.io/ios/app/volonte/id1538260624) - [PhyOSC](https://appshunter.io/ios/app/phyosc/id1597684430) - [Deflekt](https://appshunter.io/ios/app/deflekt/id6737653159) - [GLYMPHA](https://appshunter.io/ios/app/glympha/id6758812930) All apps by Masaru Suzuki: https://appshunter.io/developer/1214200807 ## Related topics [masaru suzuki](https://appshunter.io/ios/topics/masaru-suzuki) --- *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 2026-06-01.*