Horos

Horos is an open‑source medical image viewer that runs on macOS, including Apple Silicon hardware. It supports DICOM studies and provides tools for navigating, measuring, and annotating radiologic images. The application includes a reporting and sharing feature that lets users create structured reports and transmit selected studies to collaborators through a cloud‑based service.

The software is aimed at clinicians, radiologists, and researchers who need a free, macOS‑native solution for viewing and managing medical imaging data. It is used by a community of over one million users and is maintained by volunteers who contribute updates, documentation, and support resources. Compatibility with recent macOS releases and integration of the HorosCloud plugin enable secure, compliant exchange of imaging studies.

Horos is distributed under an open‑source license, allowing users to inspect, modify, and extend the code. The project provides training materials, a community forum, and regular releases that incorporate bug fixes and feature enhancements while preserving stability for clinical use.