An interactive software tool is developed to characterize the waves and instabilities present in plasma thrusters by solving for the complex zeros of plasma dispersion rela- tions. This tool helps researchers explore plasma waves and instabilities in their particular plasma thruster configuration. A user-friendly graphical interface allows versatile data in- put and parametric control. The zeros of the dispersion relation are located and tracked by root-finding algorithms based on Cauchy’s Argument Principle and Newton-Raphson’s method. Information about the instabilities found is presented through various data visu- alization options. The software tool is validated by reproducing previous work concerning instabilities arising in Hall thrusters from solutions to a simplified Esipchuk-Tilinin disper- sion relation.