nefuOS: A from-scratch OS with a browser, WebGL, and a local LLM — built in one month

Description and use

nefuOS is a fully custom OS stack built in one month with AI assistance, featuring a browser, compiler, package manager, shell, games, and a local LLM.

Problem

Build a complete operating system with a browser, compiler, package manager, and local LLM in one month using AI assistance.

Outcome

nefuOS achieved a fully functional OS stack in one month, with 1.04M lines of code, including a custom browser, compiler, package manager, shell, games, and a fine‑tuned local LLM that can call tools.

Workflow

• 1. Hand‑write ~120k lines of core kernel, VFS, IPC, and architecture.
• 2. Use AI to generate ~80% of remaining code, adding ~215k lines of self‑developed code and ~1.04M lines with third‑party code.
• 3. Implement dual BIOS/UEFI boot, TLS 1.3 stack, SWGL for WebGL2, and QuickJS bug workarounds.
• 4. Integrate custom browser, compiler, package manager, shell, games, AI, and other components.
• 5. Release on GitHub after one month.

Evidence

I hand‑wrote the first ~120k lines (kernel, VFS, IPC, the core architecture). Then I let AI fill in the implementation details — about 80% of the rest.

Source

Architecture, decisions, and debugging are mine. AI just made the typing faster.

Source

Self-developed: ~215k lines (C/C++ ~192k, Python ~24k)

Source

With third-party: ~1.04M lines

Source

One month

Source