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Abstract. A fast pseudo-monochromatic radiative transfer package using asingular value decomposition (SVD) compressed atmosphericoptical depth database has been developed, primarily for simulatingradiances from hyperspectral sounding instruments (resolution ≥0.1 cm−1). The package has been tested extensively for clear-skyradiative transfer cases, using field campaign data and satelliteinstrument data. The current database uses HITRAN 2016 lineparameters and is primed for use in the spectral region spanning 605 to 2830 cm−1. Optical depths for other spectral regions (15–605 and 2830–45 000 cm−1) can also be generated for use by kCARTA. Theclear-sky radiative transfer model computes the background thermalradiation quickly and accurately using a layer-varying diffusivityangle at each spectral point; it takes less than 30 s (on a2.8 GHz core using four threads) to complete a radiance calculationspanning the infrared. The code can also compute non-localthermodynamic equilibrium effects for the 4 µm CO2 region, as wellas analytic temperature, gas and surface Jacobians. The package alsoincludes flux and heating rate calculations and an interface to aninfrared scattering model.