iPhone Screenshots


DAF Assistant implements Delayed Auditory Feedback (DAF) and Frequency-shifting Auditory Feedback (FAF) techniques that are known to help people with stuttering to speak more fluently.

DAF Assistant can be used by people who stutter to control their speech fluency, slow down speech rate, increase confidence level, and develop good speaking habits.
It is known fact that people with stuttering problem usually speak better when do it together with another speaker. This, so called "chorus effect", causes significant increase in speech fluency. Delayed auditory feedback and Frequency-shifting Auditory Feedback simulate chorus effect by changing your own voice.

DAF delays your voice to your ears a fraction of a second. The application provides delay range from 20 to 320 milliseconds with 10 millisecond increments. FAF shifts the pitch of your voice. The application provides pitch shift in the range from one-half octave down to one-half octave up. FAF enhances the effectiveness of the application when used simultaneously with DAF.

At this moment DAF Assistant cannot operate during phone call.

To use the DAF Assistant application you will need "Apple Earphones with Remote and Mic" headset which is available in Apple Store. On iPhone you can also use Bluetooth headset.

This application is compatible with iPhone, iPod Touch, and iPad.

Please visit our web site to see more information about DAF/FAF and this application.

What's New

Version 1.4.1

Minor fixes to improve sound quality and remove static noise.

Ratings and Reviews



What could be an awesome app has left me disappointed as you can not use it in the background while using any other of the phone features, such as games, texting etc...please sort this in a future update.

Professor Badgerchops

Useful bit of kit

Pretty good. Quality is ok but has been somewhat superseded. Audio not always as crisp as some of its competitors.


Two minds

Ok, love the idea, and like 2000 pounds cheaper than other products that do the same, however you can't use it when using other functions on your phone? That's a major downside to this app! Upgrade very badly needed.


285.4 KB
Requires iOS 3.1.2 or later. Compatible with iPhone, iPad and iPod touch.
Age Rating
Rated 4+
© 2011 Artefact, LLC


  • Family Sharing

    Up to six family members will be able to use this app with Family Sharing enabled.

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