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1.      Why are there two downloadable versions of Horos? What’s the difference? Which one should I download?

Horos is continuously evolving. New features, enhancements, and bug fixes are always up and coming. The two versions available for download include the “Release Candidate” and the “Latest Version”. 


The Release Candidate includes the next step in Horos evolution. It has all the new fixes, advanced improvements, and milestones. However, the biggest difference between it and the Latest Version is that the Release Candidate is available to the community to provide feedback to us. Remember, Horos is an open source project and it would not be the success it is today without your valuable input. So, give the Release Candidate a try if you are open to providing us with constructive criticism about how we can overall improve Horos for the community. 


The Latest Version is a version that has officially been used and test driven by end users in the Horos community. 

2.           Does Horos run on Windows or Linux?

No, Horos currently only runs on a Mac computer with macOS 10.11 or later.
However, Purview Image does support Windows, Linux and even iOS/Android devices.

3.           What configuration of hardware is required to run on a Mac?

The short answer? All Mac computers that can run macOS 10.11 or later. However, viewing medical images is memory intensive and can also require considerable CPU and GPU processing power. Our recommendation is to use Mac computers with i5 processors, 16GB RAM, and equipped with a discrete GPU or Intel Iris.

4.           What MacOS should I run for each version?

MacOS 10.11 or later.

5.           How do I stay updated on recent developments? 3

Horos features a notification system that will alert you when new updates are available.  4

6.           Can I store my images in iCloud?

We recommend that you don’t. It’s risky to store your images in iCloud. If you have more than one Mac computer logged into iCloud using the same Apple ID, and Horos is running on these computers, it’s probable that you will see your database getting corrupted. Even worse, your images could get overwritten by other images.

There is a software designed to work alongside Horos to provide storage, sharing, and reporting called Purview Lite. You can access your images from any device, at any time, and you can also easily share your images securely through the cloud with other physicians or patients. Click here or contact sales@purview.net to learn more.

7.           How do I cite Horos in a paper? 3

Horos is a free and open source code software (FOSS) program that is distributed free of charge under the LGPL license at Horosproject.org and sponsored by Nimble Co LLC d/b/a Purview in Annapolis, MD USA. 4

8.           Is there any user training for Horos?

Yes! Horos Academy: Entry Edition a four-part video tutorial including: 1) First steps upon downloading Horos, 2) Image management, 3) 2D image visualization and manipulation, and 4) 3D functionalities. Horos Academy: Entry Edition is available for purchase in English, Portuguese, and Spanish, and we plan to add more versions and translations in the future. If you are looking for an easy and thorough way to learn how to use the key features in Horos on your own time and at your own pace – this is it.

If you need a comprehensive user manual and reference book, the Horos User Guide is also a valuable training tool. The Horos User Guide contains more than 300 pages of instructions for each feature and drop down menu in Horos, as well as a detailed index for easily looking up a topic.

Horos Academy and the Horos User Guide are available for purchase here: https://academy.horosproject.org/

Lastly, if you find that you require more specific help and prefer working one on one with an expert, Horos offers paid support. Fill out the form on our Support Page and one of our Horos experts will contact you about scheduling a time to work with you.

Get Horos Support

9.           What is the End User License Agreement for Horos? 

As Horos is a free and open source code software (FOSS) program that is distributed free of charge under the LGPL license, your commitment to the terms of this license when installing Horos is a requirement. You can find the agreement when downloading Horos.  4

10.       Do I have to donate? 3

No, you are not required to make a donation to download or use Horos – it is completely free to download!  Horos, however, counts on the many generous contributions made by the community to continue operating and evolving. It is thanks to your donations that we have been able to hire additional programmers, add plugins, and continue to increase Horos’s functions. Purview, the chief sponsor of Horos, has pledged to match every contribution made to at least double the value of your contribution.

11.       What is a Study? 3

For purposes of calculation of fees, a Study is defined in the Digital Imaging and Communications in Medicine (DICOM) Standard section PS3.3-2011 and refers to a single patient during a single session on a single modality as identified by a single instance Unique Identifier (“UID”).

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