Designed by a team of flow chemists and engineers, the FlowSyn Multi-X is based upon the FlowSyn, a continuous flow reactor for reaction optimization. The FlowSyn Multi-X uses a FlowSyn control interface to control either a single- or a four-rack fraction collector to enable a sequence of experiments to be performed without the need for a separate PC. Capable of running unattended, it will perform up to 10 sequential experiments and collect the results as fractions or steady-state samples, allowing the user to vary the key flow-through parameters (stoichiometry, temperature, and residence time) in each case. The system is compact with an integrated controller, enabling users to explore or optimize reaction conditions.