Bagzit is an API that allows brands to synchronize mobile app content with audio broadcasts like TV, radio, and outdoor advertising. The API embeds inaudible codes into broadcasts that trigger apps to display relevant and personalized content. This enhances viewer engagement and allows brands to increase sales, data collection, and loyalty through app interactivity like offers, polls and supplementary media. Bagzit works across environments and devices and can improve advertising metrics, TV show experiences, live events and location-based apps through its synchronized second-screen capabilities.