Fasten is a self-hosted, open-source personal health record application that aggregates medical data from thousands of healthcare providers using the FHIR protocol. It runs entirely on the user's own infrastructure, ensuring all medical records remain private and under the user's control without reliance on external cloud services. The application uses OAuth2 authentication to guide users through linking their healthcare provider accounts, pulling patient records into a unified local database.
The platform provides condition-specific health dashboards that display tailored metrics and diagnostic test tracking based on user-defined medical conditions. It supports multi-tenant family account management, allowing separate accounts for each family member with granular permission controls for viewing or editing shared health records across a household. The software is distributed under an open-source license that permits free copying, modification, and redistribution, with the requirement to mark altered versions as changed.