King-probe is a program that allows one to evaluate atomic packing, either within or between molecules. It generates "contact dots" where atoms are in close contact.

The program king-probe generates "contact dots" at points on the van der Waals surface of atoms which are in close proximity to other atoms; reading atomic coordinates in protein databank (PDB) format files and writing color-coded dot lists (spikes where atoms clash) for inclusion in a kinemage.