You enter anything on the search bar - hashtags people etc it will list you all the tweets matching it and give you a 'general idea' on what the twitter users are feeling about what you have searched for whether its been trending positively or negatively at the moment.

Built in Python using the Kivy framework it relies on the Twitter API and a Naive Bayes classifier to classify the tweets posted (max 7 days old) and give a general sentiment of the users on a particular search topic.

You don't need a Twitter account for using this.