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We introduce a powerful seminumeric modelling tool, 21 cmfast , designed to efficiently simulate the cosmological 21‐cm signal. Our code generates 3D realizations of evolved density, ionization, peculiar velocity and spin temperature fields, which it then combines to compute the 21‐cm brightness temperature. Although the physical processes are treated with approximate methods, we compare our results to a state‐of‐the‐art large‐scale hydrodynamic simulation, and find good agreement on scales pertinent to the upcoming observations ( ≳ 1 Mpc). The power spectra from 21 cmfast  agree with those generated from the numerical simulation to within 10s of per cent, down to the Nyquist frequency. We show results from a 1‐Gpc simulation which tracks the cosmic 21‐cm signal down from   z = 250 , highlighting the various interesting epochs. Depending on the desired resolution, 21 cmfast  can compute a redshift realization on a single processor in just a few minutes. Our code is fast, efficient, customizable and publicly available, making it a useful tool for 21‐cm parameter studies.

21cmfast : a fast, seminumerical simulation of the high‐redshift 21‐cm signal