SoundBird is a free Android app developed by Openbuild Co. that allows users to use their phone as a microphone and speaker to broadcast to nearby phones. The app is designed for in-person and virtual events such as outdoor sports, tours, speeches, and classes. It replaces the need for a traditional microphone in many situations.

The app features a video broadcast option that allows users to stream live video of their event. The schedule broadcast feature allows users to post their event, and potential listeners can follow the broadcast and receive notifications when it starts. SoundBird uses location proximity and profiles, eliminating the need for links. With SoundBird, users can amplify their voice at any event.