I just came across a comparision of Spine.js and Backbone.js by Hjörtur Hilmarsson. They truly sound similar but have slight differences. Hjörtur Hilmarsson is doing a very good job explaining those concepts.

Spine and Backbone are two Javascript MVC frameworks that look very similar on the surface but under the hood there are key differences.

Spine and Backbone are two Javascript MVC frameworks that look very similar on the surface but under the hood there are key differences.