AllSides is an American company that assesses the political bias of prominent media outlets, and presents different versions of similar news stories from sources of the political right, left, and center, in a mission to show readers news outside their filter bubble.[1][2][3][4] Focusing on online publications, it has rated over 800 sources on a five-point scale: Left, Leans left, Center, Leans right, and Right. Each source is ranked by unpaid volunteer editors, overseen by two staff members holding political biases different from each other. These crowd-sourced reviews are augmented by editorial reviews performed by staff members.