Chroni is a mobile application that presents archived data downloaded from the Geochron.org database in a customizable format for use by geologists in the field. It is a companion product for ET_Redux, a workflow automation system for geoscientists.

The project is developed and maintained by CIRDLES.org, an undergraduate research lab at the College of Charleston in Charleston, South Carolina, which also produces ET_Redux and a number of other tools for scientists.