Freequency is a smartphone app for people with tinnitus. Tinnitus is a ringing or buzzing in the ears without an external sound source. Freequency is designed to help users become less bothered by their tinnitus over time. It is based on two therapeutic principles: exposure therapy and mirror therapy. Users first match the sound in the app to their own tinnitus. The app then uses augmented reality to represent the sound as a bird inside a cage, in the user’s own surroundings, viewed through the phone’s camera. The user searches for the bird and releases it from its cage. This temporarily stops the sound. A new bird then appears, and you can repeat the exercise. By confronting users with their own tinnitus sound with a simple, interactive exercise, Freequency helps users to become more comfortable with and feel more in control of their tinnitus.