Syncpen: A Markdown writing app your AI can write in (Claude, Cursor, Cowork)

Agent-native, multiplayer workspace

The writing workspace your AI can actually write in.

Connect Claude Code, Cursor, claude.ai, or Cowork — and your agents work in the same project as you. They read your notes, draft into your documents, and propose edits you approve, with every change signed so you always see who did what. You stay the editor.

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No credit card · Free plan · Works with Claude Code, Cursor, claude.ai & Cowork

q3-research.md

Q3 Research Notes

Findings from the EMEA pipeline review, summarised for the board deck.

Revenue grew 12% in Q3. 18% QoQ, led by EMEA.

Claude suggestsAcceptReject

See it in action

See it in 90 seconds.

Clip three sources, let your AI draft inside a Syncpen doc, approve its edits, and publish — without leaving your workflow.

How it works

From your AI to published, in three steps.

01

Connect your AI

Add one config block to your MCP client — Claude Code, Cursor, Cline, Windsurf, or any other. One npm package, one API key; first write in five minutes. Cloud clients like claude.ai and Cowork connect to our hosted URL instead — no install.

{ "mcpServers": { "syncpen": { "command": "npx", "args": ["-y", "syncpen-mcp"], "env": { "SYNCPEN_API_KEY": "sp_your_key_here" } } } }

02

It works in your documents

It searches your library for context, drafts new documents, and proposes changes as tracked suggestions. It can read and answer your comment threads, too.

03

You approve and publish

Accept or reject each suggested change, then ship to WordPress, Ghost, or Sanity. Every edit your AI makes is signed.

The agent layer

Your agents propose. You approve. Every change is signed.

Run several agents in the same project and you still see every change, who made it, and approve it — the human-and-agent review surface no other MCP writing tool ships. This is the wedge.

the metric is roughly 12%

the metric is 18% QoQ

Track-changes, born agent-first.

Your AI suggests edits; you accept or reject each one. It never overwrites your words silently — the original stays until you say so.

Is this number current?

Updated to Q3 — yes. · Claude

Comments as a conversation.

Leave a note in the margin and your AI answers right there in the thread — not buried in a terminal log.

by yousigned · by Claude

version history

Signed and attributed.

The version history shows who wrote what, human or AI — so a shared document never leaves you guessing.

Also a great editor

Also a genuinely good place to write.

With or without an AI in the room.

Real-time collaborationMultiple cursors, live presence, and role-based sharing.

Markdown-nativeWrite in markdown, stay in markdown. No lossy conversions.

Built-in researchBibTeX, Zotero, and Mendeley import, with automatic bibliography.

One-click publishingWordPress, Ghost, and Sanity, plus PDF export.

Minimal by designThe calm alternative to all-in-one bloat.

“Why not just use…”

Each tool is great at its corner. Syncpen is the combination.

The middle column names each tool’s real strength — not a knock. Syncpen’s pitch is the combination, and being the one your AI can work inside.

If you use…What it’s great atWhat Syncpen adds on top

Google Docs + a CMSEasy sharing and editingNative markdown that publishes to WordPress, Ghost, or Sanity in one click.

NotionA flexible all-in-oneTrue markdown, a focused writing surface, and an AI that writes in your docs.

iA Writer / UlyssesA beautiful, focused writing feelReal-time collaboration and one-click publishing.

HackMDMarkdown with live collaborationA review surface for your AI — edits arrive as signed suggestions you accept or reject, not silent writes — plus one-click CMS publishing and citations.

A vector DB for agent memoryFast similarity searchA knowledge base your agent writes to that you can open, read, and correct.

If you use Obsidian

The graph you love — but your whole team writes in it.

Obsidian is the best single-player, local-first vault. Syncpen is the collaborative one: the same linked-notes graph, except your team and your AI work in it together, in real time — and you publish straight from it.

Obsidian

Best as a single-player, local-first vault.

Plain markdown files on your own disk — offline and private

A graph of your personal vault

1,400+ community plugins and themes

Native desktop and mobile apps; free for personal use

Syncpen

the collaborative one

The same graph — shared, in the cloud, with your AI in it.

A shared graph — your whole team’s linked notes, not just one private vault

Real-time co-editing with comments, @mentions, and roles

Your AI writes in it — a built-in MCP server; edits arrive as signed suggestions you approve

One-click publishing to WordPress, Ghost, and Sanity

Prefer plain files on your own disk, fully offline, with a huge plugin ecosystem? Obsidian’s the right call. Want to think together in one shared graph — with your AI in it? That’s where Syncpen wins.

Where it’s going

A knowledge base your agents read and write — and one you can actually open, read, and trust.

Today, your AI drafts, suggests, and comments — and you approve. Next: richer retrieval and durable memory across sessions.

Pricing

Start free.

Everything you need to write, connect your AI, and publish. Upgrade when you need more room and higher AI limits.

Start writing free

Free at launch · plans finalising

Encrypted in transit and at rest · OAuth sign-in · granular per-document permissions · export or delete your data anytime.

Built for researchers, coders, and content teams who live in markdown — and the AIs they work with.

Start free — connect your agents, bring a teammate, link your blog.

Create your first document