Bluff is a JavaScript port of the Gruff graphing library for Ruby. It is designed to support all the features of Gruff with minimal dependencies; the only third-party scripts you need to run it are a copy of JS.Class (about 2kb gzipped) and a copy of Google’s ExCanvas to support canvas in Internet Explorer. Both these scripts are supplied with the Bluff download. Bluff itself is around 8kb gzipped.

To draw a graph, you create a new Bluff graph object using the id of a canvas element on the page, set some options, add the data and labels, then tell the graph to draw. A basic example: