The Best Sleep Sounds App for iPhone: A Checklist Before You Download
There are hundreds of sleep sound apps, and most of them are the same twenty loops in a different skin. The ones worth keeping get a few specific things right, and you can check for them in five minutes. Mindael was built around that list, with more than 100 studio-made sounds, and it is free on the App Store. Here is the checklist.
The best sleep sounds app has true noise colors (pink for a loud room, brown for a loud mind), nature recordings long enough that you never hear the loop, a delta binaural beat for the nights when noise is not enough, a timer that fades, a mixer, and offline playback. Mindael has all of it, free on iPhone, and the sounds are measured in our own studio.
What to look for, and how Mindael covers it
| What you need | In Mindael |
|---|---|
| Pink noise for a loud room | Pink noise rendered at 3 dB per octave, the color with sleep-lab research behind it |
| Brown noise for a loud mind | True 6 dB per octave brown noise, deep and hiss-free |
| Nature that does not loop | Long studio recordings of rain, ocean, wind and fire |
| Something for the racing mind | Delta beats at 1, 2 and 3.5 Hz, and a 4-7-8 breathing guide |
| A fading timer | The sound fades out after 30, 45 or 60 minutes instead of cutting |
| Mixing | Rain over brown noise, a delta beat under ocean |
| Works offline | Every sound is on the phone |
| Price | Free to download and use on the App Store |
Start with the problem, not the sound
Sleep sounds solve two different problems. A loud room needs masking, and the best masker is a broadband sound with energy where the intruding noise lives: pink noise or steady rain. A loud mind needs something to settle into, and the sounds that do that are softer and lower: brown noise, ocean waves, a delta beat. A good app has both kinds, labelled honestly, and does not make you guess which is which. Our sleep sounds guide walks through the choice in detail.
The sounds that have research behind them
Pink noise is the color the sleep labs used. In a 2013 study in Neuron, pink-noise pulses timed to slow waves deepened slow-wave sleep and improved overnight memory; a 2017 study repeated the result in older adults. Broadband sound in general cut the time to fall asleep by about 38 percent in a 2017 transient-insomnia study. Delta binaural beats at 3 Hz lengthened deep sleep in a 2018 sleep-lab study. Mindael has every one of these sounds, made to the spec the studies describe, and you can hear pink noise and a delta beat on our sound library pages.
The small features that decide whether you keep the app
A timer that fades instead of cutting, so you are not woken by silence. A mixer, so rain can sit on top of brown noise. Long recordings, so the ocean does not reset every forty seconds. Offline playback, so the sound works on a flight or with data off. None of these is glamorous, and all of them are the difference between an app you use for a week and one you use for a year.
Volume, the part everyone gets wrong
Louder is not better. A 2014 study measured infant sleep machines and found several exceeded safe levels at full volume. Set the sound just above the room, below 50 dB at the pillow, and use the timer. The sound should be the last thing you notice, not the first.
How to switch in five minutes
- Download Mindael and open Sleep modeFree on the App Store, no account needed.
- Match the sound to the problemLoud room: pink noise or rain. Loud mind: brown noise or a delta beat with earbuds.
- Set the timer to 45 minutesLong enough to be asleep, short enough that it is not playing at 4 a.m.
- Set the volume just above the roomBelow 50 dB at the pillow. If you notice it, it is too loud.
- Keep the same sound for a weekThe brain learns it as a sleep cue. Changing nightly resets that.
Tonight, the right sound at the right volume.
Mindael has pink and brown noise measured to spec, rain and ocean recorded for the whole night, a delta beat for the racing mind, a breathing guide, and a timer that fades. Pick one sound, set 45 minutes, and let it do the rest.
- Pink, brown, white and green noise, measured
- Rain, ocean, wind and fire, no loops
- Delta beats, breathing guide, fading timer, offline
Free · No account needed · Works offline Frequently asked questions
What is the best sound to fall asleep to?
For a noisy room, pink noise or steady rain. For a racing mind, brown noise or a delta binaural beat with earbuds. A 2017 study found broadband sound cut the time to fall asleep by about 38 percent.
Does pink noise improve deep sleep?
In two lab studies, pink-noise pulses timed to slow waves deepened slow-wave sleep and improved overnight memory. Steady pink noise is not timed that way, but it is the color those studies used, and it is the best masker for a loud room.
Should the sound play all night?
For most people, no. Use a 45 minute fading timer. If you wake often, a lower volume all night is the exception.
Is it safe to sleep with sound every night?
Yes, at a low volume. A 2014 study found some sleep machines exceeded safe levels at full volume, so keep it below 50 dB at the pillow.
Is the Mindael sleep sounds app free?
Yes. Mindael is free on the App Store with more than 100 sounds.
Sources
- Messineo L, et al. Broadband sound administration improves sleep onset latency in healthy subjects in a model of transient insomnia. Frontiers in Neurology, 2017.
- Ngo HV, Martinetz T, Born J, Mölle M. Auditory closed-loop stimulation of the sleep slow oscillation enhances memory. Neuron, 2013.
- Papalambros NA, et al. Acoustic enhancement of sleep slow oscillations and concomitant memory improvement in older adults. Frontiers in Human Neuroscience, 2017.
- Hugh SC, et al. Infant sleep machines and hazardous sound pressure levels. Pediatrics, 2014.