The application pySDAR is a 64-bit application that implements ASTM E3076-18e1, Standard Practice for Determination of the Slope in the Linear Region of a Test Record (superseded), and that is available both as a graphical user interface (GUI) and a command-line interface (CLI). It is available on both Windows and MacOS and can be freely downloaded at https://sourceforge.net/projects/pysdar/. Many quality-of-life features have been added to pySDAR to allow for ease of use while still completely complying with the ASTM standard practice. For example, using the graphical application, a user can process multiple data files at the same time, separate the results into different output files (.csv and PDF), or collate them together if desired. Once the user specifies the data files and the data columns to be used as the x and y data, all the calculations are done automatically in the background, with no additional input needed.