This is available only for REDCap users with REDCap >6. 5. 0 on their servers. Collect your REDCap data in an offline environment in the REDCap Mobile App, and then sync your data back to your project on a REDCap server. REDCap is a web application, which requires the Internet to be used, but the REDCap mobile app allows for offline data collection for your REDCap projects.