Open Source

The Writing Surface
You Share With Your Agent.

One editor for writing, publishing, and scheduling. Your agent drafts in your voice. You approve every word with a keystroke. Then post to X, send to your subscribers, or queue the week — from the same pad.

$ npx openwriter install-skill

One command installs the skill, configures MCP, and opens the editor.

Get Started Free See Features

Your AI Writes. You Stay The Author.

Changes arrive as colored decorations — green inserts, blue rewrites, red deletes. Hit a to accept, r to reject, Shift+A to take it all. Every word that ships is a word you approved.

OpenWriter review panel with pending insert (green), rewrite (blue), and delete (red) decorations

Finish The Book You've Been Writing For Years.

Your agent pulls every fragment from Google Drive, Docs, and Notion — then organizes them into a workspace built for novels. Chapters nest inside Parts. Characters and worldbuilding sit alongside. You fill the gaps together.

OpenWriter bookwriting view with chapter outline in a workspace

Write X Posts, Threads, And Articles Crafted For Virality.

Your agent runs the research — source pulls, study analysis, citations. You iterate in minutes, not weeks. Pixel-accurate thread builder. Full-bleed articles with cover images.

OpenWriter X thread compose view with linked tweets

Your Mailing List. Zero Middlemen.

SendGrid-powered delivery. Bring your domain. Four layouts. Draft, preview, send — same editor. No Substack cut.

Long-Form. Straight To Your Timeline.

Cover images, rich formatting, full-bleed canvas. Ships directly to X Articles — no platform juggling, no export dance.

OpenWriter X Article compose view with cover image and long-form body

 # Your documents are just files
 ~/.openwriter/

  My Novel/

    Part I — Setup/

      Chapter 1 - Origins.md

      Chapter 2 - The Call.md

    Part II — Confrontation/

      Chapter 3 - Rising Action.md

  Newsletter Draft.md

  _workspaces/

    My Novel.json

Open Source. No Lock-in.

MIT-licensed editor. Plain .md files on disk. No database, no proprietary format. Move them, copy them, grep them, do whatever you want. Every LLM reads and writes markdown natively. Your content is always yours.

✓ MIT license

✓ No database

✓ Open any .md file

✓ YAML frontmatter

✓ Version history

✓ Export to HTML/DOCX/PDF

Draft Your Next Post Before You Close This Tab.

One command installs the skill. Your agent is writing inside the editor within a minute. Free to start, no credit card, your words stay yours.

Install The Skill

The Writing SurfaceYou Share With Your Agent.