CapilMeltor is an intuitive engineering tool designed to simplify the evaluation of melt-flow stability in plastics processing. By combining viscosity, injection velocity, and surface tension into a single capillary number calculation, the app gives engineers and operators quick insight into whether surface tension or viscous forces dominate during molding or extrusion. With built-in unit conversion, adjustable conservatism settings, and clear interpretation ranges, CapilMeltor helps users anticipate potential instabilities, optimize processing conditions, and make informed decisions without relying on complex simulations.