Gas turbines are essential devices used in nearly all fields, especially power generation. However, they are monitored without a man on duty in most cases. With technological advancement, the gas turbines can now be monitored remotely with the help of digital twin technology. However, an interface is required so that the monitoring process can be performed easily and is suitable for the various user backgrounds. The paper introduces a Graphical User Interface (GUI) using the 'Appdesigner' feature in MATLAB software to simulate the actual scenario or environment of monitoring the gas turbine for the digital twin application. The GUI is designed in an aspect that it can obtain input from an excel file or the existing data in MATLAB. The methodology consists of two steps which include design view and code view. The GUI application allows the user to load the input data, display the values and plot several output parameters such as fuel flow, turbine temperature, power, and speed. The output values are generated through Simulink, a solver used for modeling and simulating dynamic systems in MATLAB. The model is made compact and user-friendly by masking all the subsystems. The results displayed on the GUI were compared with the outputs from Simulink for validation. It shows that the call function on the interface works well and is accurate as the plot obtained was identical. The future scope of this study is that tripping predictions can also be performed for gas turbines by using this model in digital twin applications. © 2024 Author(s).