Platinum(IV) sulfite is primarily used in specialized catalytic applications, particularly in oxidation reactions where a controlled release of sulfur species is beneficial. It serves as a precursor in the synthesis of platinum-based catalysts for organic transformations, including the selective oxidation of alcohols and hydrocarbons. Due to its sulfite content, it can act as a mild reducing agent in certain catalytic cycles, enhancing reaction efficiency under low-temperature conditions. It is also explored in materials science for depositing platinum-sulfur thin films with potential use in electrochemical sensors and conductive coatings. Its application remains limited to research and niche industrial processes due to the sensitivity of the sulfite ligand and the high cost of platinum.