Hummingbird lets you see how visitors are interacting with your website in real time. WebSockets enable Hummingbird to update 20 times per second to provide you a real time traffic analysis.

Hummingbird serves a 1×1 tracking pixel to users. In the browser’s GET request it sends back tracking data generated by javascript.

Hummingbird is built on top of Node.js, a new javascript web toolkit that can handle large amounts of traffic and many concurrent users.

Right now the only browsers that support it are Chrome and WebKit Safari.