Range of KN light curves for binary configurations consistent with the chirp mass of GW190425. The ranges are computed including the uncertainties in the fitting formulae for the ejecta and disc masses. Upper bounds are obtained considering d_L = 110 Mpc (and χ_BH = 0.99 for BHNS cases), while lower bounds are obtained considering d_L = 200 Mpc (and χ_BH = 0 for BHNS cases). Coloured points with error bars are the first detections by ZTF of promising candidate EM counterparts to the event. Left and right panels: respectively, the g (484 nm) and r (626 nm) bands. Orange and blue regions refer to BHNS mergers for the EoSs APR4 and DD2, respectively. The dark orange dotted region and the light blue hatched region refer to NSNS mergers for the EoSs APR4 and DD2, respectively.