# Sonosync - Relaxing music — For sleep and meditation

> Relaxing music synchronized with your resting heartbeat for improved sleep and meditation. (iPhone/iPad app by One In A Billion Ltd.)

- Source: https://appshunter.io/ios/app/sonosync-relaxing-music/id990197299 (this page in markdown: same URL + `.md`)
- Developer: [One In A Billion Ltd](https://appshunter.io/developer/479881389)
- Category: Health & Fitness, Lifestyle
- Price: Free with in-app purchases
- Rating: 4.70/5 from 99 App Store ratings · 7 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 144 MB
- Languages: American English, French (France), German (Germany), European Spanish
- Released: 2015-07-07
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/sonosync-relaxing-music/id990197299/reviews.md

## What is Sonosync?

Music in tune with your resting heartbeat™. 
Full album of relaxing music included with the free version. Improve your relaxation and get more refreshing sleep.
Unlock the app to gain extra features:  control the music tempo - move to slower tempos as your relaxation improves over time; fade into a deep sleep with the sleep timer; plus lots more photos. 

The Sonosync app contains five different musical compositions, each recorded at three different tempos, providing over two hours of music. Our studies have shown that listeners find the version with the tempo closest to their heartbeat to be the most relaxing. 

The free version of this app allows you to listen to five full length compositions at the highest tempo. All the music has been mastered for iPhone and iPad listening. We recommend headphones for the best quality, but the mixes have also been optimised for the built-in speakers.

Unlock the extra features and receive the following:

Full control

Get all three variations of each composition. You choose the tempo that is most relaxing for you. Over time you may find you gradually move to the slower versions as your relaxation levels increase.

Each variation was recorded and mixed separately by the composer. There are subtle differences in every recording, in order to make the music work perfectly at each tempo. Every note, beat and echo is in perfect sync!

Drift into sleep

Use the sleep timer to automatically fade out the music and drift into a peaceful sleep.

Get all the photos

You will also receive all 36 beautiful photos which automatically play in the background.

## Key features

- Heartbeat-synced music
- Adjustable music tempo
- Sleep timer
- Background photo slideshow
- Multiple musical compositions
- Optimized for iPhone and iPad

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Sonosync | $3.99 | one-time |


## Recent user reviews (7 of 7)

All indexed reviews: https://appshunter.io/ios/app/sonosync-relaxing-music/id990197299/reviews.md

### 4/5 — Relax

*2023-08-04, version 1.0.9*

L'application sonosync est une très bonne appli pour se détendre 
Mai si il y avait plus de musique ça serait 5 étoiles

### 4/5 — Very good music

*2021-10-11, version 1.0.9*

I really enjoy the calm music and the relaxing background images. I just have one request and that is to add a repeat track button so the user could repeat a song in a loop.

### 4/5 — Appli calme je ne m'en passerais plus pour m endormir

*2016-10-10, version 1.0.5*

Supere 👍

### 5/5 — Highly recommend

*2015-12-30, version 1.0.5*

I highly recommend this app, the music is great for relaxing or drifting off to sleep, and the images are lovely. There are 3 options to each tune offering a variation of tempo and sound depending on your mood and level of relaxation required. The sleep timer also works a treat. I recently contacted the creators and they were quick to respond. I originally had this music on CD so was thrilled to find it on an app. I have tried a lot of other ambient/relaxation apps but this has to be one of the best....!!

### 4/5 — Good App

*2015-08-17, version 1.0.2*

A good app to meditate and reflect with, I particularly like the water featured music and the ability to modify the tempo.  The photos are lovely and you get a much wider range with the update.  It would be nice to be able to control the length of time the app spends on each photo, but overall, enjoyable to use.

### 3/5 — Free version doesn't do much

*2015-08-10, version 1.0.2*

This app is a pretty decent free app, but it's not much more than an audio player. I didn't see anything that would support the claim of matching your heart rate. And the picture and music selections are pretty limited.

My sense was that you could easily do the same thing with any audio player like the iOS Music app. Having said that, the audio samples the free version has are not bad. The sleep timer is a neat twist.

The frustrating thing was that the app offers the feature in the user interface, not grayed out. Then if you select the feature, such as the tempo, it prompts you to upgrade. 

The free version does give one a sense of what the app is all about.

### 4/5 — Great for helping me sleep

*2015-07-23, version 1.0.1*

I found the music invaluable for helping me sleep in the late stages of pregnancy. My baby daughter fell asleep to it this morning too! I seem to enjoy the middle speed the most.

## Frequently asked questions about Sonosync

### Does Sonosync have ads?

No, Sonosync does not contain advertisements. The app is free to download and use with in-app purchases for additional features.

### What is the rating for Sonosync?

Sonosync has an excellent rating of 4.7 stars based on 99 user reviews.

### What devices does Sonosync support?

Sonosync is compatible with iPhone, iPad, and iPod devices.

### How often is Sonosync updated?

The latest version of Sonosync was released on September 25, 2019, indicating it receives periodic updates.

### What age rating does Sonosync have?

Sonosync is rated for ages 4 and up, making it suitable for a wide audience.

### Can I control the music tempo in Sonosync?

Yes, unlocking extra features in Sonosync allows you to control the music tempo, moving to slower tempos as your relaxation improves.

### How much does Sonosync cost?

Sonosync is free to download and includes a full album of relaxing music. Additional features can be unlocked through in-app purchases.

### What kind of music does Sonosync offer?

Sonosync offers five different musical compositions, each recorded at three different tempos, providing over two hours of music designed for relaxation and sleep.

## Version history (last 5 releases)

### 1.0.9 — 2019-09-25

- bug fixes
- update UI for iOS 13

### 1.0.8 — 2018-09-23

- Various bug fixes

### 1.0.7 — 2018-05-03

- Now Optimized for iPhone X
- Various Bug Fixes

### 1.0.5 — 2015-11-03

- various bug fixes

### 1.0.4 — 2015-10-11

・ Bug fixes

## Apps similar to Sonosync

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Relaxing Music - Calm & Sleep](https://appshunter.io/ios/app/relaxing-music-calm-and-sleep/id1523028250) | 4.7 (2,578) | Free | Health & Fitness |
| [Relaxing Sounds, Sleep Easy](https://appshunter.io/ios/app/relaxing-sounds-sleep-easy/id502222888) | 4.7 (16,318) | Free | Health & Fitness |
| [Doze: Sleep Sounds and Stories](https://appshunter.io/ios/app/doze-sleep-sounds-and-stories/id1482827839) | 4.7 (393) | Free | Health & Fitness |
| [Deep Relax Sleep Music](https://appshunter.io/ios/app/deep-relax-sleep-music/id614153824) | 4.6 (4,424) | Free | Health & Fitness |
| [Relax-Age Magic & Meditation](https://appshunter.io/ios/app/relax-age-magic-and-meditation/id1447595867) | 4.5 (18,846) | Free | Health & Fitness |
| [BetterSleep: Relax and Sleep](https://appshunter.io/ios/app/bettersleep-relax-and-sleep/id314498713) | 4.7 (390,681) | Free | Health & Fitness |

## More apps by One In A Billion Ltd

- [Chart Music](https://appshunter.io/ios/app/chart-music/id479881186)
- [Writers Session](https://appshunter.io/ios/app/writers-session/id1172558973)
- [Chordio: compose & learn music](https://appshunter.io/ios/app/chordio-compose-and-learn-music/id1580214821)
- [Chordio+: create & learn music](https://appshunter.io/ios/app/chordio-plus-create-and-learn-music/id1662210145)
- [Writers Session Pro](https://appshunter.io/ios/app/writers-session-pro/id6756976450)

All apps by One In A Billion Ltd: https://appshunter.io/developer/479881389

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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 2026-08-31.*