Number counts inferred from the A³COSMOS database in four ALMA bands: red, Band 3 (2.6–3.6 mm); orange, Band 4 (1.8–2.4 mm); green, Band 6 (1.1–1.4 mm); blue, Band 7 (0.8–1.1 mm). Number counts were measured by combining blind surveys and single pointings containing a detected source within 1 arcsec radius around the phase centre and excluding a central area of 1 arcsec radius in Bands 3, 4, and 6, and 4 arcsec in Band 7. Top panel: Differential. Bottom panel: Cumulative. The number counts calculated in this work are shown as solid lines, with the shaded area indicating the uncertainty resulting from flux density, contamination, and completeness errors, quadratically combined with Poisson errors. The respective flux densities of the individual sources are shown as points in the cumulative panel. The vertical dotted lines indicate the flux density above which our number counts can be considered complete. Number counts from the literature are shown as symbols and are colour-coded to the respective ALMA band.