Post

Despite Sartre's efforts to unite the two (see: Between Existentialism and Marxism), their differences are obvious. Existentialism is a largely individualist philosophy, it asks each individual to seek the meaning of their own personal lives.

Further, it posits that our freedom is curtailed by some universal truths. Marx, meanwhile, emphasized that there are very real material conditions (i.e. capitalist production) which limit all our freedoms. One is an idealist philosophy, the other is materialist.