Tap To Speak (TTS) is an app used during live events when the attendees ask questions, or the speaker needs feedback from the audience. Typically there is a mic set up in an aisle or is passed around so that the person asking questions can be heard. Tap To Speak enables their smartphone as a microphone. It also allows the audience to engage live during the event using their text commenting, responding to surveys, and polling.
This app requires a unique event ID that can be setup and obtained at https://taptospeak.com where you must setup your own account.
Free trial is available.