Light curve in the V band for SN 2024iss compared to those of well-sampled cases: Type IIb SNe 1993J, 2011dh, 2013df, 2016gkg, and 2020acat. The light curves of the comparison SNe have been shifted in both magnitude and time to align with the peak magnitude and the time of the V light-curve peak of SN 2024iss. The dashed black line represents the expected decline rate of [56]Co (0.98 mag (100 day)⁻¹; Woosley et al. 1989). The upper-right inset shows a zoom-in of the first 30 days.