FluencyCoach helps people who stutter control their stuttering, increase their confidence level, and immidiatelly improve their speech in even the most challenging situations, such as public speaking or when making a phone call. When used regularly for autonomous at home practice or in conjunction with speech therapy, FluencyCoach will produce significant carry-over fluency, permenantly improving users' speech. The software uses altered auditory feedback technology to simulate the effect of "choral speech" (speaking simultaneously with another person), known for years to promote fluency in individuals afflicted by various dysfluencies and has been particularly successful in treating stuttering. The delayed auditory feedback (DAF) and frequency-shifted auditory feedback (FAF), both implemented in FluencyCoach, are the most effective types of altered auditory feedback for treating stuttering. The effect of DAF basically amounts to hearing your voice with a slight delay after speaking, like an echo. FAF changes the pitch of your voice, lower or higher, enhancing the illusion of another voice speaking along with you. Both, DAF and FAF, each reduce stuttering aproximatelly 70%, immediately, without training, speech therapy, mental effort, or abnormal-sounding speech, and has been demonstrated to produce significant carry-over fluency. Combining DAF and FAF reduces stuttering over 80%. Capitalizing upon the immediate effects of altered auditory feedback, FluencyCoach can be used as a standalone speech aid helping you achieve fluency in any situation. Furthermore, to facilitate production of carry-over fluency, FluencyCoach can be used for autonomous stuttering treatment or in conjunction with a stuttering therapy.