SciteScite is a smart citation index that provides context and classification for scientific citations. It allows users to see how papers have been cited by showing the surrounding text and categorizing citations as supporting, contrasting, or merely mentioning the cited work. The platform is powered by a database of over 1.2 billion classified citation statements from 187 million full-text articles, utilizing machine learning to analyze scientific literature across various disciplines. Scite has indexing agreements with academic publishers, including Wiley, Karger, Sage, Cambridge University Press, and more. It also gets data from different open sources such as unpaywall, pubmed, preprint servers, university repositories, and open access journals. Free Chrome extension available.