This mobile app for the deafblind community allows two-way communication using smartphones and haptic feedback. As the deafblind can neither hear nor see, the application has an “invisible” user interface. In order to enter a message, the sender uses screen taps that mimic the language of Morse code. Taps of different durations form letters and words. The recipient then gets the message through vibrations. Actions and commands are executed by gesture control, such as flipping the phone for sending a message.