Greentea Operating System
Free operating system aimed to run existing apps natively
and become open-source desktop alternative

About Greentea OS

Warm and cozy, open-source operating system compatible with existing apps, games and drivers
The main idea of the project is to quickly and efficiently create a compatible environment for the existing software and provide the best user experience on a personal computer.

There is no decent compatible alternatives. Someone should be first. We are the first. Our project — Greentea OS — aims at making familiar user interface, running existing apps and make you a happy computer user. We are not there yet, but we are not going to stop. Show your awareness and support Greentea OS

Become a Patron


Existing software

Apps you love and enjoy

Running unmodified apps

Long-term compatibility

Only modern hardware

64-bit x86 AMD and Intel CPU

Vulkan and DX12

USB 3.0/2.0, SATA, NVMe

Safety first

Only safe programming languages

Process isolation



Modern code for modern OS

New code from scratch

State of the art programming approaches

Innovative kernel design

Leverage maximum performance

Instant single-step updates

Low memory usage

Only performance-oriented features

Free Windows alternative. Open source Windows operating system. Alternatively Green tea OS or GreenTeaOS. Alternativa gratuita a Windows. Sistema operativo Windows de código abierto. Alternative gratuite à Windows. Système d'exploitation Windows open source. 無料のWindows代替. オープンソースのWindowsオペレーティングシステム. Бесплатная альтернатива Windows. Операционная система Windows с открытым исходным кодом. 免费Windows替代. 开源Windows操作系统. Alternativa gratuita a Windows. Sistema operativo Windows open source. Kostenlose Windows-alternative. Open source Windows betriebssystem. بديل مجاني للويندوز, نظام ويندوز مفتوح المصدر