Responsory is perceived as one of Celtic's biggest rivals. Responsory is headquartered in Brookfield, Wisconsin, and was founded in 1999. Like Celtic, Responsory also operates in the Professional Services industry. Responsory generates 75% the revenue of Celtic.
Celtic VS 8THIRTYFOUR
8THIRTYFOUR has been one of Celtic's top competitors. 8THIRTYFOUR was founded in 2005 in Grand Rapids, Michigan. Like Celtic, 8THIRTYFOUR also works within the Marketing Services field. 8THIRTYFOUR generates $7M less revenue than Celtic.