ALFAsim is a 1D dynamic multiphase flow simulator which resulted as the natural evolution of the simulation technology developed for its preceding well and pipeline flow simulators. It combines a robust mathematical formulation with an advanced numerical strategy to deliver a computationally efficient simulation experience in an intuitive interface. Simulations are set up and launched in a modern workspace environment and the results are plotted in a versatile and intelligent manner by featuring simple, fast, and user-friendly sequential steps for pre- and post-processing.