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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 (plainmd 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 🙏
About Rune on Product Hunt
“Markdown that renders as you type — code, diagrams, math”
Rune was submitted on Product Hunt and earned 9 upvotes and 1 comments, placing #32 on the daily leaderboard. 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 (plainmd 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.
On the analytics side, Rune competes within Productivity, Open Source, Developer Tools and GitHub — topics that collectively have 1.3M followers on Product Hunt. The dashboard above tracks how Rune performed against the three products that launched closest to it on the same day.
Who hunted Rune?
Rune was hunted by HyunbinJang. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Rune including community comment highlights and product details, visit the product overview.
HyunbinJang