Sonosync - Relaxing music 4+

For sleep and meditation

One In A Billion Ltd

    • 4.8 • 28 Ratings
    • Free
    • Offers In-App Purchases



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.

Full details:

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.

What’s New

Version 1.0.9

- bug fixes
- update UI for iOS 13

Ratings and Reviews

4.8 out of 5
28 Ratings

28 Ratings

Orijan ,

Highly recommend

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....!!

Solange Wonder ,

Good App

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.

Tiredmum ,

Great for helping me sleep

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.

App Privacy

The developer, One In A Billion Ltd, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.

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