“…The majority are dedicated to analysis of HRV [ 7 , 10 , 12 , 13 , 14 , 15 ], with a few designed specifically for investigation of the EEG [ 16 , 17 , 18 , 19 , 20 ]. Many HRV analysis tools—such as Kubios HRV [ 13 ], HRVAS [ 21 ], HRVFrame [ 14 ], gHRV [ 7 ], HRVAnalysis [ 15 ], RHRV [ 22 , 23 ], RR-APET [ 10 ] and PyBioS [ 24 ]—include a selection of complexity and entropy methods, although some older ones offer only a single such measure [ 13 , 25 , 26 ], and others such as PyHRV are not in GUI form [ 27 ]. We found only one EEG-specific software whose main focus is on complexity or entropy measures [ 5 ], although a complexity toolkit for resting state functional magnetic resonance imaging (fMRI) was located, also containing a handful of entropy measures [ 28 ].…”