I wonder if there is something like this I could use for automated testing of style changes to an app/site. Currently I have to regression test the style manually.
A partner of mine has used http://mogotest.com/ on a production site to add some regression testing for visual changes. You'd have to look into it more specifically, but I believe it worked fairly well.
Wraith, used by BBC: https://github.com/BBC-News/wraith
Huxley, by Facebook: https://github.com/facebook/huxley