Yes! Absolutely! Just take the part in the this.$get on line 20 and move it into it's own object and then you won't need Angular anymore.

Why it's a provider for Angular is simply because we're using Angular for work and my primary goal is to use this for our application while doing synchronizations and fetching external resources.

In case you're interested, I built one that doesn't use Angular or jQuery: http://buunguyen.github.io/rainbow.js/

The most interesting thing for me about the frameworks is how they all use different methods of rendering the bar itself.

So far I've seen straight css, canvas, and css transitions.