Rhun, an open-source code editor written in assembly

A closer look at Rhun, an open-source code editor written in assembly

What Rhun is

Rhun is a small, fast code editor for Windows, Linux and macOS that is written in assembly. The site repeatedly emphasizes compactness and speed as core goals.

What you can do in Rhun

You get typical editor features: tabs, syntax highlighting, fuzzy search and an optional Vim mode. There is a built-in terminal emulator that supports 24-bit color, scrollback, mouse reporting and alternate-screen support.

Rhun includes built-in Git with staging, diffs and commit history. It can generate commit messages using a local model or via Claude Code or Codex subscriptions, and it can follow Claude Code and Codex sessions for your projects.

Appearance and customization

There are multiple built-in light and dark themes, customizable editor and terminal colors, and automatic theme switching with the system's dark mode and with Omarchy.

Questions people ask about Rhun, an open-source code editor written in assembly

Is Rhun cross-platform?

Yes, the page states Rhun is for Windows, Linux and macOS.

Does Rhun include a terminal?

Yes, it has a built-in terminal emulator with 24-bit color, scrollback, mouse reporting and alternate-screen support.

Can Rhun work with Git and generate commit messages?

Yes, it has built-in Git for staging, diffs and commit history, and can generate commit messages using a local model or Claude Code or Codex subscriptions.

Rhun, an open-source code editor written in assembly was shared on NexURLs by Nexis on November 3, 2026, in Tools.