Ionic is the the top open source framework for building amazing mobile apps. We use the brand new Ionic 3 with TypeScript.
Ionic 3 uses Angular 4 to power its front end.
Socket.io provides real time events using WebSockets. We use this for our apps to communicate with our Node.js back end.
MongoDB is a document-driven NoSQL database that provides storage for our users and chat history.
Sass is a robust CSS extension language that makes develpmet and design faster and easier.