Rune - Markdown that renders as you type — code, diagrams, math

Rune is a focused, fast Markdown editor for desktop. In one pane, your Markdown formats the moment you type — only the line you're on shows raw source. Code, Mermaid diagrams, KaTeX math, and tables render right where you write them, while the page stays calm. Local-first (plain .md files), built on Rust so it opens instantly and stays small. Korean/CJK is first-class. Free & open source (MIT) for macOS, Windows, and Linux.

Hi Product Hunt 👋 I'm Hyunbin, an indie developer from Korea. I built Rune because every Markdown editor I used made me choose between two columns — raw source on the left, a rendered preview on the right. That split always pulled my eyes away from where I was actually writing. I wanted one pane: text that just becomes formatted as I type, with the raw markdown showing only on the line my cursor is on. Getting that to feel right was the hard part. Everything lives in a single CodeMirror 6 document — code blocks, Mermaid diagrams, KaTeX math, and tables render in place, and collapse back to source as the cursor enters the line. I built it on Rust + Tauri so it opens instantly and stays small instead of bundling a whole browser. And since I'm based in Korea, Korean/CJK typography is first-class, not an afterthought. It's early (v0.1.3) and it's just me — so I'd genuinely love your feedback on what feels good, what's missing, and what breaks. Free and open source (MIT), for macOS, Windows, and Linux. Repo: https://github.com/JangHyun-bin/... Thanks for taking a look 🙏

Rune - Markdown that renders as you type — code, diagrams, math

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