COMPLIS is an experimental facility designed to carry out spectroscopic studies on radioisotopes produced by disintegration of elements available at CERN's Booster-ISOLDE on-line isotope separator. During recent series of experimental runs, hyperfine structure measurements have yielded information on nuclear moments and deformations of platinum and iridium isotopes. For the first time, population by alpha-decay from Hg was exploited to investigate Pt178-181 - the most neutron-deficient Pt isotopes yet studied. Successful measurements have recently been carried out on Ir182-189.