This project provides an Android app Keppel that interfaces with mobile data collection software of the ODK ecosystem and which allows ISO 19794-2 fingerprint templates to be scanned and/or validated as part of an XLSForm. We also provide a second app, the Keppel CLI, a command line interface which is designed to be run on a computer workstation. Keppel CLI can compare two fingerprint templates and return a matching score and is primarily useful for post-hoc quality assurance and audit.