HTrack (Household Tracking) is an application built in R-Shiny for use on encrypted Android devices. This app was created to allow for offline data collection in studies where stringent data-security requirements must be met (see https://doi.org/10.1371/journal.pone.0244028), though it can also be run online if needed. The application allows for field navigation and secure field-level data capture. It also serves as a bridge to an alternate software, like EpiInfo, to collect participant-level questionnaire data. This repository houses:

• The source code for this application for users or researchers performing field-studies or other field-assessment strategies,
• Installation instructions and app dependencies.
• Troubleshooting is provided through the Issues within this repo as needed.

HTrack is setup and ready to use by following three main steps, as outlined below: