This master thesis deals with issues of development of applications for augmentative and alternative communication (AAC) in environment of special education for mentally challenged pupils with communication disorders. Thesis presents issues of development contemporary applications and follows on design principles of Computer therapy project, which compliance during the design and implementation should prevent the current issues. The aim of the thesis is creation of application for AAC of YES/NO type and i-CT framework - framework simplifying creation of similar apps for described environment. Both apps works on iOS and Android systems and were tested in an environment of people with mental disabilities.