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By FutureAcoustic

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"Best App for Creating Quiet Workspaces"
-, 10 Top iPhone Apps For Road Warriors

"Best App for Shutting Out Noise"
- O'Reilly, Best iPhone Apps

"If you struggle trying to concentrate with irritating noises going on all around you, try Soundcurtain"
- Tech Digest, The 101 best iPhone apps in the world today

"Struggling to complete a project, but distracted and distressed by noise? SoundCurtain may be just the tool you need to banish distracting noise while focusing on the task at hand."
- MacWorld

Do you ever find it difficult working with background noise? You find listening to music interferes with your concentration?

Sound Curtain is a unique application that masks distracting noise by automatically adapting its volume, pitch and tone in response to the noise around you.

Comes with seven generative tracks - featuring intelligent, self-adjusting white noise and harmonic sounds that listen and react to your environment.

Sound Curtain: keeping the outside world where it belongs - outside.

(Powered by FutureAcoustic a3 / Requires headset with mic)


- Forbes:
- Tech Digest:
- Gizmodo:
- Macworld:
- T3 podcast:
- Pocket-lint:
- iphonic:


SoundCurtain is an entirely new concept in sound control using advanced adaptive masking technology, powered by FutureAcoustic's adaptive acoustic architecture (a3) engine. It works better than Active Noise Cancellation or traditional (steady-state) masking for blocking-out fast-changing, informationally-rich noises, such as speech.

The technology monitors noise in your environment through your headset mic and performs real-time spectral analysis to calculate the energy content across a number of perceptually-important frequency bands. Sound is then generated in response, with its spectral content optimized to mask ambient noise. The sound is generated through a generative sound engine, using probabilistic rules to ensure that it is varied subtly over time, so that it doesn't become tiring.

You are able to customize the generated sound by changing its 'Sensitivity', which sets how quickly it adapts to sensed noise; its 'Min level', which sets the minimum playback level even when there's no noise around you; and the overall volume through the side buttons of you iPhone or iPod touch.

SoundCurtain ships with a set of sounds which are optimized for masking, while (critically) staying in the background of your perception - allowing you to concentrate or relax.

The 'Noise masker' is scientifically extremely accurate and is the most advanced masker that exists in any platform or device today. To test it, use the standard iPhone headset and set the headset volume to maximum; set 'Sensitivity' to maximum and 'Min Level' to the minimum setting; ask someone to talk to you - you should not be able to understand them. The generated sound should match exactly the spectrum of the sensed speech, without any discernible delay.

The other maskers use more emotive sounds and pleasant harmonics - they aim at increasing acoustic comfort in a noisy environment by partial masking, effectively transforming noise into soothing sound.

To learn more about the technology, visit

What's New in Version 1.4

- Optimised for iOS 4 (app now works in the background)
- Updated for Retina display

iPhone Screenshots

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Customer Reviews

This App Saved My Sanity

I came across this app while living above a very noisy corner in NYC for six months.

I had never lived in an urban environment before and found it very difficult to get to sleep due to all of the noise below at all hours of the night.

Once I discovered SoundCurtain and found the settings that worked best for my environment (Rain, Sensitivity as high as it can go, Min Level at 50%) and moved my iPhone dock-equipped speaker system directly in front of the window where most of the noise originated (so the microphone on the iPhone can pick up as much of the noise as possible), I was not only able to fall asleep quickly, but, on mornings that I didn't set an alarm, I was able to sleep right through rush hour traffic below and slept until 11AM on multiple occasions.

This app is the best $0.99 I've ever spent. It may seem odd until you get used to it, but it definitely worked for me.

Perfect for getting mentally challenging work done in loud, public places

I am the type of person who needs near silence to concentrate. This app doesn't create silence but it does do what it says: it creates a curtain of unobtrusive, ambient sound to negate the irritating music and bustle of public cafės, airports, and classrooms full of study hall kids working on group projects (or goofing off).

My suggested setting is theme "rain", "sensitivity level "max, "min level" at lowest.

Great Product - Must have App

I often work or read in coffee shops, live in an apartment near a freeway, and deal with unwanted noise in many ways. The app uses noise canceling techniques and adds a broad range of rain, harmonics, ocean, forest sounds to add additional masking. It responds to the level of local sounds and adjusts accordingly. It is great with standard ear buds but fantastic with noise canceling head phones. I can easily close the curtain and move into my own private and quieter world.

View In iTunes
  • $4.99
  • Category: Productivity
  • Updated: Dec 08, 2010
  • Version: 1.4
  • Size: 37.0 MB
  • Language: English
  • Seller: Future Acoustic LLP.

Compatibility: Requires iOS 4.2 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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