The “QSO-Striker” is a derivative of the “Exo-Striker“, which was developed for modeling the variability of quasar light-curves (QSOs). It can perform MCMC and nested sampling, Gaussian Processes modeling, a.k.a. Damped Random Walk (DRW) model. The QSO-Striker offers fast fully interactive plots, and export ready-to-use, LaTeX tables with best-fit parameters, errors, and statistics. It combines Fortran efficiency and Python flexibility and is cross-platform compatible (MAC OS, Linux, Windows).