This reference app, built in ReactJS for the Web, is a fully functional voice notification system that can be deployed to Heroku in minutes, allowing developers to create flexible solutions that scale to accommodate high-volumes or new regions. The application enables users to send voice notifications to hundreds of recipients in three steps, with features such as broadcast capabilities, recipient validation, and text-to-speech functionality. To get started, developers need to sign up for a Twilio account, deploy the app, and launch it using Heroku. The open-source reference app aims to accelerate development and foster Programmable Voice feature discovery, providing a comprehensive demonstration of its features.