SPEKTR v3.0 includes the option of generating a spectrum using the TASMICS or TASMIP model with a separate panel displaying inherent filtration. The default model has been modified to include 1.6 mm Al inherent filtration natively to match spectra generated by TASMIP. Version 3.0 also includes the ability to zoom, pan, and determine photon output values at different points on the spectrum through the addition of a toolbar in the top left of the GUI. The spektr, spektrCompounds, and spektrTransmissions figures were modified to automatically resize to fit the dimensions of the user’s computer and to allow the user to change the window dimensions. The plot of the spectrum was changed to automatically rescale the y-axis so as to fit the full graph. In addition, an error in the densities of Gadolinium Oxysulfide and Gallium Arsenide was corrected in spketrCompoundDensity and an editable textbox was created under the “X-ray Tube Settings” panel to specify the thickness of copper used to filter the spectrum. SPEKTR 3.0 is described in the following paper: Technical Note: spektr 3.0—A computational tool for x‐ray spectrum modeling and analysis.