High sensitivity of the optical absorption edge of chalcogenide glasses (ChG) to external factors, such as photo-illumination [1, 2], irradiation with high-energy particles and γ-rays [3], pressure [4], etc. is a major research interest over the past few years for their fundamental understanding and also for device applications. The simplest way to record the effect in the fundamental optical absorption edge region is to measure transmission characteristics. In turn, transmission spectra usually are used to determine absorption coefficient, optical bandgap, thickness of thin films, etc.[5]. Such calculations demand a significant data processing, managing of different files and formats. As a rule, the universal computer software are normally used for these purposes, such as Mathematics, Maple, Mathcad and others, which are tedious and require expensive licences and knowledge of the software. However, the script creating process, programming and then managing of files, if, for example, there are many files with input data and from different spectrophotometers takes a lot of time of the researchers. There are some commercially available programs for extracting parameters from the optical transmission data, such as TFCalc (Scientific Software, Inc.),“Refractor”[6] and others, but they are expensive and/or difficult to obtain. So, creating of the computer program with user friendly interface to calculate simplest things, such as absorption coefficient, Tauc plot, optical gap, thin film thickness and refractive index using transmission spectra only is the need for various researchers in many areas of research, especially those studying thin films.