A device (10) for preparing a cosmetic combination (12), comprising: a structure (28) extending along a longitudinal axis (X-X′), receiving at least one capsule (16) containing at least one component of a cosmetic composition (12), an outlet nozzle (32) opening at one end (34), fluidically connected to a receptacle (14) or to a preform, and a piston (36) free to move in translation along the longitudinal axis (X-X′) suitable for perforating the or each capsule (16) and conveying contents of each capsule (16) to the outlet nozzle (32). The device (10) comprises at least one planar support (17) carrying in an integral manner a cosmetic product, with each planar support (17) being arranged in the housing (30), with at least one portion of each support (17) being arranged to be driven by the piston (36) to the receptacle (14) containing the cosmetic composition (12).