Updated project metadata. Here we perform a global analysis of cardiac protein expression in humans and model organisms across cardiac chambers using quantitative mass spectrometry based proteomics. We measure >6,500 proteins in each species and create a global comparison of cardiac protein expression across species. The data was collected in an online database for access by cardiac researchers. This data will enable researchers to e. g. choose the best model organism for a scientific question at hand, facilitate transfer of knowledge between studies conducted in different model organisms and help to integrate knowledge of cardiac physiology and disease to point to new leads in cardiac research.