Built Like an Operating System
OnerOS brings desktop-class interaction patterns to the browser. Every feature is designed to feel spatial, responsive, and alive.
Window Manager
A complete window management system with drag, resize, snap, minimize, and maximize — bringing desktop-class spatial organization to the browser.
One System. Multiple Personalities.
Seven distinct visual themes — from classic desktop recreations to the original Fluent Valley design language.
Select a theme to see it come alive
The signature Fluent Valley design — floating glass surfaces, spatial motion, and modern depth.
Open an App. Feel the System.
Explore the OnerOS experience through interactive previews. Each app opens inside a system-styled window.
Select an application from the launcher
Interactive concepts inspired by OnerOS Web Preview. Interfaces evolve as the system develops.
Try the live Web PreviewOnerOS Web Preview 3.1.0
Experience OnerOS directly in your browser. Window management, applications, themes — all running live.
Classic Themes
Run WinSync, Google, and more inside authentic Windows 95, XP, macOS, and Ubuntu themes.
7 Themes
Application Launcher
Access Settings, Personalization, Google, Facebook, Bing, ReVideeo, and more from the Start Menu.
15+ Apps
Personalization
Switch between 7 themes, choose wallpapers, and set accent colors — all in real-time.
Fluent ValleyA Growing Ecosystem
OnerOS is part of a broader project ecosystem. Explore the applications and tools built alongside it.
A media application within the OnerOS ecosystem for video content.
Visit project (external)An image and media application within the OnerOS ecosystem.
Visit project (external)A video-on-demand platform within the OnerOS ecosystem.
Visit project (external)A calculator utility within the OnerOS ecosystem.
Visit project (external)Built in the Open
OnerOS is open-source under GPL-3.0. The codebase is available for review, contribution, and learning. Built with React 18 and TypeScript.