Vevox is a free real-time audience engagement app designed for workplaces and classrooms. The app is available on iPhone and offers several features such as live polling, Q&A board with ‘Like’ upvoting, surveys, group discussion, anonymity, moderation, reports, branding, and PowerPoint add-in. Vevox was previously known as Meetoo.

With Vevox, users can create live polls and surveys on the go, which makes it easy to engage with audiences in real-time. The app's Q&A board allows participants to ask questions and upvote those they find most relevant. Vevox also provides a group discussion feature that enables users to create open forums for discussion.

One unique feature of Vevox is its anonymity option, which allows users to answer polls and ask questions without revealing their identity. The app also has moderation tools that help users filter out inappropriate or irrelevant content. Additionally, Vevox provides detailed reports on audience engagement and participation.

In conclusion, Vevox is a great app for anyone looking to engage with their audience in real-time. It's easy to use, offers a range of features, and is available for free on iPhone.