iSpartan is a versatile app for molecular modeling on the iPad, iPhone, and iPod Touch. The app allows any chemist fast and easy access to computational methods that have proven reliable for a large range of molecules. Molecules are created by two-dimensional sketching, analogous to drawing a structure on paper. The app converts the two-dimensional sketch into a three-dimensional structure. Low-energy conformations can then be calculated and their geometries be queried. A database of 5,000…