or Oracle VirtualBox. This allows you to install Windows 8.1 as a "guest" OS within your current system. On Android: Limbo PC Emulator
: A more comprehensive mockup that includes the boot screen, login screen, desktop, and various apps for a "pixel-perfect" real-time experience. uCertify Windows 8.1 Simulator windows 81 simulator
Many developers host JavaScript-based recreations on platforms like GitHub or private sites. These allow you to click the "Start" button and explore the full-screen Start screen directly in your browser. or Oracle VirtualBox