Flapjax is a new programming language designed around the demands of modern, client-based Web applications. Its principal features include:

1. Event-driven, reactive evaluation
2. Templating syntax
3. Persistent data saved on a data store we provide
4. Convenient data sharing
5. Access-control for shared data
6. Interfaces to external Web services

Flapjax is easy to learn: its syntax is precisely that of JavaScript. Furthermore, because Flapjax is built entirely atop JavaScript, it runs on traditional Web browsers without the need for plug-ins or other downloads. In fact, you can (in exchange for a little more code) use Flapjax purely as a library in JavaScript rather than use the compiler from Flapjax to JavaScript, so you can integrate it into your existing programs.