His style reflects the transition from the Rococo to Neoclassicism. He favoured clean lines and balanced compositions. In his medal designs, he used classical allegories like olive branches and figures of peace. These designs were precise and functional. He worked with bronze and marble. His drawings for monuments show a clear focus on architectural structure. He avoided the excessive decoration common in the early eighteenth century. Instead, he chose a restrained aesthetic that emphasised clarity.

Collectors today value Vassé for his technical precision and neoclassical logic. His sketches and medal designs offer a glimpse into the formal planning of eighteenth-century art. These works function well in modern interiors because of their monochromatic nature and balanced proportions. They provide a sense of historical weight without being overly ornate. His studies of medals and monuments are particularly suited to gallery walls or minimalist spaces. They represent a period of French art that valued order and classical tradition.