FAIMS Mobile is an open source, generalised and customisable system for digital data collection on Android, created by the FAIMS project. As a server-client system it facilitates simultaneous operation by multiple users. It is designed to work offline and record free text, multimedia, structured or spatial data. It’s great for large teams operating in degraded network, or entirely offline, who need to generate consistent and complete digital datasets. Originally designed for archaeological fieldwork, FAIMS Mobile can be used by any field data collection project.