Speech corrector can be used by people who have stuttering problem to control their fluency. It provides DAF (delayed auditory feedback) method. That method has been applied in the therapy of stuttering people for a long time. Numerous studies have shown the positive influence of that method on speaking process. Stuttering people who speak into a microphone and hear delayed sounds of their own speech in headphones or a speaker begin to speak fluently. DAF reduce stuttering on average 70 - 85% without training and mental efforts.