Rhun is a small and fast open-source code editor written in assembly. The editor provides essential features including tabs, syntax highlighting, fuzzy search, and an optional Vim mode.
Rhun: A lightweight, open-source code editor written in assembly with AI support
The tool is designed to allow users to run builds, shell commands, and coding agents alongside their code. While AI capabilities are optional, Rhun allows users to draft messages using local open-weight models or existing subscriptions to Claude Code and Codex. It also enables users to follow sessions as Claude Code and Codex perform tasks.
Users can choose from 39 light and dark themes. For Windows, the software is available as a ZIP file that can be extracted and run directly via rhun.exe.
Sources
- Show HN: Rhun, an open-source code editor written in assembly （Hacker News Frontpage, 2026-10-01）