Building a real-time stock quote app is made accessible through PubNub, which facilitates the streaming of information to an HTML5 web browser interface. By using JavaScript, PHP, and PubNub, developers can create an app that updates stock quotes in real-time, as demonstrated by a practical example available both as a live demo and in a GitHub repository with supplied code. The app operates by sending data from a PHP server to an HTML5 JavaScript app via the PubNub network, utilizing WebSockets to display information instantly. Although the app streams live stock data, the numbers are randomized, and users are advised not to base financial decisions on them. Interested developers can sign up for free to start using PubNub for real-time stock quotes.