This software package and sample analyzed data is a first version of a suite of swell analysis from SWOT 250-m posting data (unsmoothed). The tools allow to select regions for spectral analysis, identify swell signature, remove the 180° ambiguity on the direction of propagation and subtract a noise level. More details can be found in : Fabrice Ardhuin, Beatriz Molero, Alejandro Bohé, Frédéric Nouguier, Fabrice Collard, Isabel Houghton, Phase-resolved swells across ocean basins in SWOT altimetry data: revealing centimeter-scale wave heights including coastal reflection, Geophys. Res. Lett. (in review)