Mergely lets you compare any text with rich intuitive interfaceMergely is an online diff/merge editor and javascript library that highlights changes in similar texts. I can be used within your own web application to compare files, text, C, C++, Java, HTML, XML, CSS, and Javascript.
All credit goes to http://www.mergely.com. For any bugs/issues, please raise request at http://goo.gl/lhVWNs.