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Several studies have shown that stellar activity features, such as occultedand non-occulted starspots, can affect the measurement of transit parametersbiasing studies of transit timing variations and transmission spectra. Wepresent $\texttt{PyTranSpot}$, which we designed to model multiband transitlight curves showing starspot anomalies, inferring both transit and spotparameters. The code follows a pixellation approach to model the star with itscorresponding limb darkening, spots, and transiting planet on a two dimensionalCartesian coordinate grid. We combine $\texttt{PyTranSpot}$ with an MCMCframework to study and derive exoplanet transmission spectra, which providesstatistically robust values for the physical properties and uncertainties of atransiting star-planet system. We validate $\texttt{PyTranSpot}$'s performanceby analyzing eleven synthetic light curves of four different star-planetsystems and 20 transit light curves of the well-studied WASP-41b system. Wealso investigate the impact of starspots on transit parameters and derivewavelength dependent transit depth values for WASP-41b covering a range of6200-9200 $\AA$, indicating a flat transmission spectrum.

$\texttt{PyTranSpot}$ - A tool for multiband light curve modeling of planetary transits and stellar spots