The Caproni AP.1 equipped a total of eight squadriglie (Italian air unit equivalent to half an RAF squadron) of the assault wings of the Regia Aeronautica.
Four examples were acquired by El Salvador for use in the Escuadrilla de Caza (a fifth aircraft was shipped to replace an aircraft which crashed during a ferrying flight), and another seven were sold to Paraguay and used in the Chaco Postwar period (1939-1945).