OpenMarkdown

Feather-light. Light-speed.

A local-first Markdown editor built for you and your agent.

Download View on GitHub
free · rust-core · no account ▲ #5 Product of the Day on Product Hunt
Welcome to Markdown

Simple syntax, real formatting

A second-level heading

bold, italic, strikeout

a quote
•item 1
todo
done
# code block
print('hello world')
Try the demo in your browser More Markdown syntax →

Catch your idea before it slips.

An idea gives you about five seconds. OpenMarkdown takes less than one.

< 1s
cold start (P50)
0.2s
click → window
.md
plain files, no lock-in

A native Rust core: the window is there before you let go of the mouse.

what’s new

You and your agent, on the same page. Literally.

The enter key shouldn’t fire before you’re done.

A real prompt shouldn’t live in a one-line box — point $EDITOR at OpenMarkdown, write it like a document, hand your agent the finished thing.

No undo, no drafts, no half-sent prompts.

Your Agent.

No AI inside. That’s the point.
It runs on the agent you already have.

Connect your agent →

Your File.

Local-first means every note stays a plain .md on your disk.

  • no database
  • no lock-in

Your Memory.

The file is the memory. Agents change; your knowledge doesn’t.

  • persistent
  • portable

Your notes, worked on together.

Your agent runs in a terminal tab right in the sidebar — the one you installed. It reads, finds and writes on the page you’re looking at.

No AI ships inside OpenMarkdown. Terminal and intercom: macOS and Linux.

Find

Ask, don’t hunt.

Ask where something is. Your agent opens the right note and takes you to the heading — you read your own words, not a summary.

Launch plan

Everything for v1.0 lives in this one file.

  • Write the release notes
  • Pick the launch date

Launch sync — Jul 7

Notes

Staging is green; docs site still pending Mia’s QA pass — the long pole.

Decisions
•Launch date: Friday, Jul 10 — go/no-go Thursday 4 pm.
•Docs can ship the morning of.
Action items
•Sam — cut the release branch Wed.
•Mia — final QA pass Thu.
> what did we land on for the launch date?
⏺ opened meetings/2026-07-07.md
Read

Show, don’t paste.

Select a passage and ask. Your agent reads exactly what you selected and reworks it in place — nothing to copy into a chat box.

Vendor options

•Acme — $12/mo, fast, no SSO
•Globex — $9/mo, slow, has SSO
•Initech — $15/mo, fast, has SSO
VendorPriceSpeedSSO
Acme$12/mofast—
Globex$9/moslow✓
Initech$15/mofast✓
> make this a table
✓ formatted in place
Write

One section, not the whole file.

Ask for a draft under a heading. Only that section changes — the rest of your note stays exactly as you left it.

Launch plan

Checklist
  • Write the release notes
  • Pick the launch date
Announcement

v1.0 is out. OpenMarkdown now opens in under a second.

Your agent can work right in the sidebar.

Download it free at openmarkdown.dev.

> draft the announcement under Announcement
✓ wrote 1 section · launch-plan.md
Co-edit

Your turn, then its turn.

Tick a box or fix a line. Your agent sees the change and picks up from there — no need to explain what you did.

Launch plan

Checklist
  • Write the release notes
  • Pick the launch date
  • Decide who announces

Date set: Fri, Jul 10. Next up: who announces — Sam or Mia?

⏺ waiting for your edit · launch-plan.md
✓ saw your tick — next: who announces
Talk

It answers in the sidebar.

Type to your agent in the intercom; it replies in a line or two — never its working notes.

Launch plan

Checklist
  • Write the release notes
  • Record the demo video
  • Pick the launch date
  • Decide who announces
Claude Codelistening
tidy the checklist
Done. Two items need your call: the date and who announces.
Say something…
⏺ write_section · launch-plan.md

It feels right.

Control without leaving the keyboard.

cmd+p and you’re there.

Skip the file tree. Skip the menus.

  • @jump to any heading
  • anythingfuzzy-find any file
  • >run any command
@auth
#Authenticationjump ↵
##Auth — token flow
##Auth — session store

One tap. Three modes.

One key cycles all three — live preview, plain source, clean reading.

Markers render as you type; your cursor enters an element and it snaps back to source.

Every marker visible, syntax-coloured, one size. True plain text for commit messages and prompts.

No cursor, no markers, just the page.

# Auth revamp — plan

**Drafted with my agent** — we’re both in `plan.md`: it writes, I tick, it reads the ticks back.

  • map the current token flow
  • draft the migration steps
  • flag anything risky - [ ] flag anything risky
# Auth revamp — plan **Drafted with my agent** — we’re both in `plan.md`: it writes, I tick, it reads the ticks back. - [x] map the current token flow - [ ] draft the migration steps - [ ] flag anything risky

Just Markdown files

Byte-for-byte. OpenMarkdown never reflows, trims, or reformats your text — open and close, the file is unchanged.

Safe by default

Delete moves files to the system Trash. Autosave when you pause, without nagging. Tabs, folder, and cursor come back after a crash.

No account, no cloud

No telemetry, nothing phones home. Your agent reads the same file on the same disk — no third party in between.

The keys you already know

Standard Mac shortcuts — and ⌘P opens a palette for every command. Full list →

中文 · 日本語 · English

Full trilingual UI. Missing your language? Open a discussion.

The openmd CLI

Open files from your terminal. Install it in one click from Settings.

Open .md with OpenMarkdown.

Download OpenMarkdown
macOSApple Silicon & Intel Windowsx64 · note-only LinuxAppImage · x64
Mainland China mirror · 中国大陆镜像 — macOS · Windows · Linux macOS (universal, signed & notarized) · Windows (x64) · Linux (AppImage). Agent co-editing runs on macOS and Linux today; the Windows app is a native editor with it coming soon. On Windows and want agent co-editing now? Run the Linux build under WSL. Weighing it up? See how it compares · FAQ

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