I love this app, and I love ’most everything you’re doing with it. I do hope you’re not going to get on this “passive voice is evil” bandwagon, though, and that — if you are going to provide any passive voice detection “service” — you also manage somehow to get it to identify the passive more accurately than everything else and also provide a link to sources that explain how (1) the passive probably isn’t what you think it is and (2) it really needn’t be avoided.
Please see linguist Geoffrey K. Pullum’s relevant posts at [Language Log](http://languagelog.ldc.upen... at the Institute for Research in Cognitive Science at the University of Pennsylvania.