Does this mean that we cannot build complex web applications with React? No. Absolutely not. React boasts a large, high quality and very active ecosystem of libraries that, in turn is based on, extends, or complements React in such a way that it does not need to hide behind large scale frameworks like Ember or Angular. Quite the opposite actually. Once we have entered the React ecosystem and gained a first impression, we quickly find a number of really good tools and libraries with which we can build professional, super individual and highly complex applications.