Joosy allows you to create web apps which work completely in the browser. So that, it helps you to relocate all your Rails Views to the client side. It also helps you with managing the growing quantity of JS code. On another hand, it makes your backend to have exactly one function – to be a simple REST provider. That leads to easier development support and improves the scalability greatly.
Besides Rails, Joosy is based on top of CoffeeScript, jQuery and Sugar.js in role of ActiveSupport.
Finally, Joosy boosts your development drastically. Just like Rails does.