Blending in a refinery is an essential step to minimize cost and maximize profit while producing products within the required specifications and demands. All the available components are utilized to produce specified products. Advancement in blending techniques has made it possible to create products with specific octane numbers, vapor pressure, or viscosity while utilizing the components available to satisfy specifications and environmental regulations. There are two types of advanced blending optimization systems: offline blending optimizers and online blending optimizers. Both have unique applications and benefits. This topic will discuss the specifications of offline blend optimizers, a comparison concerning the benefits of both systems (offline/online), and the phased implementation strategy of blend optimizers.