ReactOS for Windows

Used ReactOS for Windows?

This 0.3.13 alpha version of ReactOS is pre-release software and should be used with caution. Pre-release versions are inherently less stable than official releases and you should be aware that such software can cause problems to your computer system.

Editors’ Review

Download.com staffFebruary 26, 2026

ReactOS is a free, modern operating system striving for Windows compatibility. It's built from scratch to mimic Windows architecture, offering an open-source alternative.

Pros
- Open-source Windows compatible operating system
- Free to download and use
- Designed to mirror Windows architecture
- Not based on Linux or Unix
Cons
No Cons available

ReactOS for Windows

Used ReactOS for Windows?

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Full Specifications

GENERAL

Release: March 22, 2011

Latest update: February 26, 2026

Version: 0.3.13-alpha

OPERATING SYSTEMS

Platform: Windows

Operating System

Windows 2000
Windows 10
Windows NT
Windows 2003
Windows XP

Additional Requirements: None

POPULARITY

Total Downloads: 4,622

Downloads Last Week: 2

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User Reviews

3/5

3 User Votes

Alternative to Windows OS
LincNebMarch 10, 2011
Pros
Free laid out like a Windows OS
Cons
Numerous, buggy, system would lock up often. Some of the programs listed were there to be downloaded or didn't work. Unstable.
Summary
I downloaded the stable version from ReactOS site. It gives a nice looking platform to run WINE that isn't on Linux as such. The one that was to be on a VirtualBox appliance had an error in it so it would load in VirtualBox. I downloaded the CD ISO. It loaded into VirtualBox, but was still buggy.as mentioned earlier. It is based on interesting idea, but really shouldn't be put out to the public until it runs much better.
Does not work on SATA hard drives without SATA drivers.
CatSoftLabsJanuary 22, 2011
Pros
Runs windows apps and is easy to use.
Cons
Does not work on SATA without having to slipstream drivers.
Summary
Great,very easy to install,and even easier if you have a IDE hard drive.
Good OS ;D
57389June 6, 2010
Pros
I't was realy cool!
Cons
No cons!!!
Summary

Developer’s Description

Take an open source approach to create a Windows compatible operating system.

ReactOS is a free, modern operating system based on the design of Windows XP/2003. Written completely from scratch, it aims to follow the Windows architecture designed by Microsoft from the hardware level right through to the application level. This is not a Linux based system, and shares none of the unix architecture.