'Crystal hack' by Dr M Kanagasabapathy is used to predict h, k, l from 'c' as well as 'a' values for cubic and HCP binary alloy crystals from XRD data (2-Theta diffraction and wavelength of X-rays). d-spacing and hkl can be predicted precisely.
Inbuilt data base for some elemental crystal system is included. It can be a useful tool for powder diffraction researchers / students to predict or shift in diffraction angle with hkl indices for cube-HCP binary alloy crystals.