Since that time, I developed and deployed version 1.0 of the simplest product I’ve ever designed: Shush for the iPhone and iPod touch.

Check out Shush on the iTunes App Store.

Shush is an onomatopoeically titled iPhone application whose only purpose is to generate a constant shushing static noise, similar to the noise you might make when you want to quiet a baby who is frantic with fussiness and crying. Of course, you might also use it to calm your fussy and frantic self in a noisy airport, subway, or neighborhood where you live.

Partly due to time constraints, and partly due to purity of vision, Shush is an extremely simple 1.0 application. Its user interface consists of just a single button for starting and stopping the shushing, and a slider for fine-tuning the volume.

Although I really enjoy the minimal design of the app so far, I can see adding some features as time goes on. For instance, users have almost instantly asked for “pink noise” in addition or instead of the default white noise which is currently being generated. A common joke about pink noise is “you know, for girls,” but actually what pink noise refers to is a more appropriate distribution of the randomness in the noise, to suit the way that the human brain hears audio. Learn more about the colors of noise on Wikipedia.

Why White Noise?
Some of you without babies of your own may be wondering what white noise has to do with calming a baby. I read somewhere that every, or at least almost every, culture on earth has a word that is used for calming babies, and invariably it includes some form of this “shush” syllable, geared towards getting white noise out of soothing human’s mouth. In my reading of several books about baby care I have come across repeated advice to use shushing with a fussy baby, and it’s become especially emphasized by the very popular book: The Happiest Baby on the Block, by Dr. Harvey Karp.

One thing I can tell you is this product has already been extensively field tested. It’s easy enough to make a shushing noise with your mouth, but it gets tiring, and can be hard to sustain. I almost always have my iPhone with me, so it’s great to know that if a serious, full-blown fussy tantrum is taking place, I’ve got a little technological help in my pocket. How well the app will do among the general public is anybody’s guess, but I’m sure there will be at least a few jubilant parents out there who find this as useful as I do.

iPhone: $299.

Shush: $0.99

Stopping a fussy baby from screaming inconsolably? Priceless.