Tin(II) iodide is primarily used in research and specialized chemical synthesis. It serves as a precursor in the preparation of other tin-containing compounds and is employed in the development of perovskite materials for optoelectronic applications, such as solar cells and light-emitting diodes. Due to its semiconducting properties, it is also investigated in thin-film technologies and photovoltaic devices. Additionally, it finds use as a reagent in organic transformations where controlled tin-based chemistry is required. Its role in catalysis and material science continues to be explored in academic and industrial laboratories.