In this paper, a Graphical User Interface (GUI) is developed in MATLAB environment for educational and research purpose in the field of control engineering. This interactive user-friendly software focuses on the behavior and performance analysis of linear time invariant control system in time as well as frequency domain. The user can input the dynamics of the system in the form of transfer function or state-space format in GUI. Further, there is a facility of dropdown list where the user can get information about poles and zeros, transient response analysis for step and impulse input, Bode, Nyquist and Nichols diagrams. The report regarding controllablity and observability of the system can also be generated using this toolbox. This toolbox has three sections, one for entering dynamics of system in state-space or transfer function form, second for selecting the different performance parameters to be analyzed and last the output panel for figures and reports. Moreover, the user can simultaneously compare performance of two systems.