Comparison of various metallicity catalogues based on Gaia DR3 with the stars in the training sample with log 𝑔 > 3.9 corresponding to the main-sequence stars. After the comparison with the Pristine-Gaia synthetic catalogue, and the Pristine DR1 catalogue, the panels show the comparisons for the Gaia GSP-Spec metallicities based on the Gaia RVS spectra (Recio-Blanco et al. 2023, smaller circles correspond to stars flagged as unreliable in this catalogue, following the same criteria as in their Figure 26), the Gaia GSP-Phot catalogue based on the BP/RP information (Andrae et al. 2023a), the XGBoost algorithm that uses the BP/RP information and some additional non-Gaia photometry (Andrae et al. 2023b), the BP/RP-based metallicities from Zhang et al. (2023, smaller circles are flagged results). In all panels, the color encodes the temperature of the star from the training sample. The dashed line corresponds to the 1-to-1 line and the dotted lines represent offsets of 0.2 dex.