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Horos for Windows: a browser-based alternative.

By Dr. KW Chan · Reviewed 14 October 2026

Horos is a free, open-source DICOM viewer for macOS; its website lists macOS and Apple Silicon builds (checked October 2026). On Windows, a browser-based viewer such as NoustaView opens DICOM files without an install.

What Horos's website says

The Horos website lists macOS builds, including Apple Silicon. Horos is free and open source under LGPL 3.0, and it installs as a desktop app. For Windows users, the site points to a different product.

Checked October 2026 at horosproject.org. Horos is a trademark of its owner; NoustaView isn't affiliated.

Opening DICOM on Windows in the browser

Open noustadicomviewer.com/app/ in Chrome or Edge.
Open a file, a folder or a .zip from your drive, or drag it onto the viewer.

The study is decoded and rendered in the tab. Nothing is uploaded unless you choose Share Case, and closing the tab removes the study.

What you get in NoustaView

Multiplanar reconstruction in axial, sagittal and coronal planes, freely rotatable around any axis, with thickness (mm) slabs and Average or MIP projection.
Length, angle and HU probe measurements, and built-in CT window presets on keys 1 to 7.
Exam/Class Mode for teaching sets and exams.
Share Case, a Supporter and Pro feature: a de-identified copy goes up only after a preview you confirm, and the recipient needs no account.

NoustaView running in a true full-screen view on a curved monitor, showing two MRI brain panels with no browser chrome or toolbar visible at all — NoustaView in full-screen view, showing two MRI brain panels.

Horos and NoustaView side by side

Feature	Horos	NoustaView
Runs on	macOS (including Apple Silicon)	Runs in the browser (Chromium recommended)
Install needed	Yes (desktop install)	No install
Free use terms	Free and open source (LGPL 3.0)	Viewer, MPR, measurements, Exam Mode and image export are free
Oblique MPR	—	Yes
MIP	—	Yes

— means the product's website doesn't state it.

Other Windows options

RadiAnt DICOM Viewer offers downloads for Windows as an installer. Its feature list includes oblique MPR.
MicroDicom runs on Windows as an installer or portable version. It is free for non-commercial use and lists oblique MPR with MIP, MinIP and AVG projections.

For a wider table, see free DICOM viewers compared.

It is not a certified medical device and is not intended for primary diagnostic use, and it does not replace a calibrated diagnostic workstation.