performs sentence-based sentiment analysis. It relies on FRED, a successful machine reader for the Semantic Web, and applies appropriate rules to mine FRED’s graphs. It provides two interfaces: one to measure the “sentimeters” of a sentence, the other to visualize a semantic graph representation of a sentence enriched with opinion-related information, e.g. opinion holder, topics, sentiment scores, etc. Sentilo is available as a REST service that returns RDF as output.