Show HN: Rhun, an open-source code editor written in assembly

Rhun, an open-source code editor written in assembly, has been showcased on Show HN. It is presented as a small, fast editor in which AI does the heavy lifting. Rhun combines conventional coding tools with optional AI workflows.

Core features include tabs, syntax highlighting, fuzzy search and optional Vim mode. Rhun can run builds, shell commands and coding agents beside the code. Together, these tools form a compact workflow for developers who prefer not to switch among separate applications.

AI is explicitly optional. Users can draft commit messages with local open-weight models, or with Claude Code and Codex using subscriptions they already hold. Rhun can also follow a project’s Claude Code and Codex sessions as those tools work.

Rhun also provides Git actions: reviewing diffs, staging changes and committing. These sit beside its terminal and agent capabilities, creating one workspace for editing, checking and committing code. The combination may serve programmers who routinely use shell tools and AI assistants.

Rhun offers 39 light and dark themes, six of which are previewed in the launch presentation. Linux and macOS users can install it through a terminal command supplied with the latest GitHub release. Windows users can download a ZIP archive, extract it and open rhun.exe.

Rhun’s main proposition is an assembly-based editor that treats AI as optional, not essential. It may appeal to developers seeking fast navigation alongside local and subscription-based model access. Its Git, terminal and session-following tools also make it a broader development environment.

The Show HN post includes no benchmarks, adoption figures or independent reactions, leaving those points unverified. Rhun’s uptake may depend on daily performance and the reliability of its integrated AI and Git tools. Its immediate pitch is a compact, cross-platform editor that keeps AI optional.

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