This fan-made OS brings Windows Phone back to one specific Android device
windowscentral.com Oct 22, 2026

This fan-made OS brings Windows Phone back to one specific Android device

AI-summarised brief · reviewed before publication

ztOS, a fan‑made operating system that mimics Windows Phone 8.1, has been released for the Samsung Galaxy S9. Built on Arch Linux for ARM, the OS uses a custom ztMETRO shell written in C and accelerated with OpenGL, and ships with its own app suite, a Python/Qt SDK and an OTA updater. The project, led by developer Claude and generated largely with AI‑assisted code, is currently in alpha and limited to the S9, meaning installation carries risk and bugs are expected. ztOS aims to recreate the iconic Metro UI and functionality of the discontinued Windows Phone platform, offering users a nostalgic alternative to Android and iOS ecosystems. Reviewers praise fluid UI yet warn only S9 support limits broader adoption currently.

💡 Why It Matters

  • · By resurrecting the Metro experience on modern hardware, ztOS shows how niche nostalgia can drive open‑source innovation, potentially inspiring similar revivals for other discontinued platforms.