How did Marxism differ from utopian socialism?

Karl Marx and Friedrich Engels distinguished their approach from that of earlier reformers—such as Saint-Simon, Charles Fourier, and Robert Owen—by labeling the latter "utopian" and their own "scientific" socialism.1

The primary differences include:

• Methodology: Utopian socialists sought to establish model communities to demonstrate the benefits of harmonious cooperation. In contrast, Marx and Engels argued that socialism would emerge through the inevitable clash of social classes, a process rooted in the material and economic conditions of history.1
• Theory of History: While utopian socialists relied on idealistic visions of a future society, Marx developed a materialist theory of history. He viewed history as a series of struggles between classes over resources and the means of production, rather than a progression driven by abstract ideas.1
• Role of Revolution: Marxists believed that the internal contradictions of capitalism would lead to a revolution by the proletariat. They saw themselves not as architects of a perfect society, but as facilitators—or "midwives"—to an inevitable historical transition.1