I was thrilled to find this app for those children and adults who stutter.  My youngest is a stutterer and I can't wait to share this app with him.  Here is some additional information about this app:

 

"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."