Color-magnitude diagrams for the 15 selected objects (same symbols as in Fig. 5) and known young ultracool dwarfs in IC348 from Luhman et al. (2024, orange), young T-dwarfs from Zhang et al. (2021, olive green), the young L7 companion VHS 1256b (green; Miles et al. 2023), the young late-L companion 2MASS 1207b (purple; Luhman et al. 2023), the young T3.5 dwarf companion Gu Psc b (pink; Naud et al. 2014), the young L7 dwarf WISEA J114724.10-204021.3 (cyan; Schneider et al. 2016), the young L7 dwarf PSO J318.5338-22.8603 (yellow; Liu et al. 2013), and all the ultracool dwarfs classified as low or intermediate gravity in the IRTF/SpeX ultracool dwarf library (grey diamonds; Burgasser & Splat Development Team 2017). Their photometry in the Euclid bands was derived from their spectra as described in the text. The SPLAT standard sequence for field ultracool dwarfs is also represented as a red line when the corresponding filters are available, and the spectral type scale is indicated. Extinction vectors are also represented.