A fast, light markdown editor that opens any `.md` file instantly. Your agent reads, writes, and co-edits the same file you're in — through a CLI, an agent plugin, and MCP. Local-first: no account, no telemetry, your files never leave your disk.
Hey Product Hunt 👋 I'm XUEYANZ, and I built OpenMarkdown — a local-first, agent-native `.md` editor.
OpenMarkdown has two layers:
- Native agent read, write, and co-edit.
- Instant for peeking at `.md` files.
**About the agent**
Markdown files are more common than ever in the era of coding agents — AGENTS.md, CLAUDE.md, plan.md, design.md, and so on.
OpenMarkdown's CLI and MCP give your agent a direct line to:
- read what you've highlighted (only when asked — no monitoring, no copy-paste)
- find and jump to the target section (opening the file if it's closed)
- co-edit the very same file simultaneously
Note: there are no AI agents built into OpenMarkdown. And that's the point.
A single agent doesn't know all my projects. Luckily, I can fire up any agent and connect it to OpenMarkdown for project-specific context while I write.
So I built a "co-edit mode", where `- [ ] @agent turn these notes into a table` wakes the agent for real-time collaboration.
When it's done, the agent marks the item complete and appends a timestamp — which makes planning tasks trackable and countable.
**About the speed**
Existing `.md` editors feel slow when all I want is to peek at a file and make a quick correction.
With response speed in mind, it's built with Tauri 2 and purposely leaves out the caching that hogs a huge amount of RAM.
Because it's fast, I use it as my default `$VISUAL`/`$EDITOR` for composing Claude Code prompts — so I don't mis-send any half-written messages.
**It's free.** Try it at https://openmarkdown.dev.
macOS only today — Linux and Windows are close behind.
I'd love for you to try it and tell me what you think. I value every idea — it's what helps OpenMarkdown grow.
Interesting call to make it "co-edit" instead of AI-suggest. How do you handle simultaneous
edits when both you and the agent are typing in the same block — CRDT-style merge or last-write-wins?
Congrats on the launch! I like the idea of keeping the editor lightweight while letting users bring whichever agent already understands their project.
The shared-file approach feels much more natural than copying content between an editor and a separate AI pane. I’m curious how you prevent collisions when the user and agent edit the same section at once.
Looking forward to trying it.
Curious what sets this apart from collaborating with an agent on a .md file in something like VSCode?
Co-edit mode writing into the same .md file I'm actively typing in is the part I'd stress-test first — most 'agent + editor' tools use a separate pane precisely to dodge that. When the agent and I write to the same section at once, how does it reconcile: file-watch reload with last-write-wins, or an actual diff merge so my in-flight edits aren't clobbered? And since you dropped caching for RAM on Tauri 2, does peek-open stay instant on large multi-MB markdown, or is that where the no-cache tradeoff shows?
There are countless of markdown editors out there, and I failed to understand what seperates yours. You should pivot towards that; why would someone use this over Obsidian or similar tools for example. Good luck!
the co-edit mode is the part I want to know more about, specifically the collision case. if I'm mid-sentence typing in one section while the agent is writing to a different part of the same file at the same moment, does it just interleave the writes cleanly, or is there some kind of lock/turn-taking so we're not fighting over the same save
About OpenMarkdown on Product Hunt
“A markdown editor you and your agent co-edit”
OpenMarkdown launched on Product Hunt on July 18th, 2026 and earned 102 upvotes and 8 comments, placing #5 on the daily leaderboard. A fast, light markdown editor that opens any `.md` file instantly. Your agent reads, writes, and co-edits the same file you're in — through a CLI, an agent plugin, and MCP. Local-first: no account, no telemetry, your files never leave your disk.
OpenMarkdown was featured in Productivity (656.3k followers), Notes (8.3k followers) and Developer Tools (515.9k followers) on Product Hunt. Together, these topics include over 226.7k products, making this a competitive space to launch in.
Who hunted OpenMarkdown?
OpenMarkdown was hunted by XUEYANZ. 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.
Want to see how OpenMarkdown stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
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