Voxer is a San Francisco-based technology company that provides a walkie-talkie app for smartphones. The app allows users to send voice messages, text messages, and photos to individuals or groups. Voxer was founded in 2007 and has raised over $30 million in funding. The company has been downloaded over 200 million times and has been used by companies such as Coca-Cola, Groupon, and the Boston Celtics.