Phase field modeling is a powerful tool for simulations of the microstructure evolutions. Its applications to practical alloy systems, however, have been limited mostly due to difficulties in relating the energy functional to the thermodynamic properties of the systems and mobilities to kinetic properties of the alloy elements involved. A phase field modeling tool, PanROME (Research Of Microstructure Evolution), has been developed that offers capabilities to overcome these difficulties. It can use the thermodynamic and kinetic databases that are built based on the CALPHAD approach, thus making it suitable for simulations in multicomponent and multiphase systems. This phase field model integrates Kim-Kim-Suzuki (KKS) model which allows simulations in a practical length scale while maintaining a reasonable interfacial energy with a multiphase model that is applicable to multiphase systems. Several applications of the PanROME modeling tool to Ni-base superalloys are demonstrated in the present article.