Fail to see a convincing need to see the appeal of such an app for chat users. Need to think through a use case better and apply technology. IDOL OnDemand sentiment analysis and other APIs can provide very powerful capabilities to analyze large data sets which can provide more generic insights on trends.

Really need to focus on what are you folks really trying to solve or achieve. Build on problem statements more, figure out what you are trying to provide as a product or service. Use your common sense and do some user study, test quick and fail quick.

Who is the consumer for this kind of services is not very clear - need to create strong value proposition for someone to analyze their own chat