An interactive, multi-user data visualization app in celebration of the universal constant pi. Built with React/Redux, D3, socket.IO, MongoDB, NodeJS, express, and mongoose by a 5-person team in a week-long sprint. Users can submit circumference/diameter measurements and contribute to a real-time global approximation of pi. Teachers and groups can start and save sessions to investigate small sets of classroom data. A Monte Carlo pi approximation simulation allows users to interact with pi in a unique way. App is fully responsive for mobile, tablet, and desktop view.