This paper presents a new automatic tool for assessing the linguistic quality of scientific papers written in English. A set of complex lexical and syntactic surface-level rules compute more than 80 style-related variables. Their combination, defines the score of a text in the four dimensions of style assessment for scientific papers: clarity, variety, concision and conviction. The software have been tested on 60 published articles and incorporates an animated agent that acts as a personal assistant, explains the results to the writer and how to improve them.