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SPECIFICTION
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Composer

usecomposer.md

From $5.99/mo Free plan Web
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Spec score 8.4 #10 of 31 in Markdown editors

What it is

Composer is a web-based, real-time Markdown editor where people and AI agents work on shared documents. Agents connect through MCP and join documents as collaborators, with permission to read and write shared content. Changes synchronize across teammates, devices, and sessions. Composer uses plain Markdown, keeping files readable in other editors, and supports Markdown export. The listed publishing workflow is none. Free users receive unlimited public documents and collaborators, plus up to seven private documents, three collaborators per private document, and a 10 MB upload limit. Pro removes the private-document and collaborator limits and adds early access to new features. Pro Annual costs $5.99 a month billed annually at $71.88 a year; Pro Monthly costs $7.99 a month billed monthly. Users can cancel anytime, with paid access continuing through the period. Stripe handles checkout.

Spec sheet

Supported platforms
webRead 20 Sep 2026 · usecomposer.md
Free plan
YesRead 20 Sep 2026 · usecomposer.md
Agent Collaboration
Agents join documents as true collaborators.Read 28 Sep 2026 · usecomposer.md
Agent Connection
AI agents connect to Composer over MCP.Read 28 Sep 2026 · usecomposer.md
Billing Provider
Checkout is handled by Stripe.Read 28 Sep 2026 · usecomposer.md
Cancellation Policy
Users can cancel anytime, with the plan active through the paid period.Read 28 Sep 2026 · usecomposer.md
Change Sync
Changes sync across teammates, devices, and sessions.Read 28 Sep 2026 · usecomposer.md
Cloud sync
YesRead 20 Sep 2026 · usecomposer.md
Early Feature Access
Pro includes early access to new features.Read 28 Sep 2026 · usecomposer.md
Editor Type
Composer is a real-time, multiplayer Markdown editor for people and agents.Read 28 Sep 2026 · usecomposer.md
Export formats
MarkdownRead 20 Sep 2026 · usecomposer.md
Free Collaborators
Each free private document supports up to 3 collaborators.Read 28 Sep 2026 · usecomposer.md
Free Plan
Composer offers a free plan to get started.Read 28 Sep 2026 · usecomposer.md
Markdown Compatibility
Composer uses plain Markdown, keeping documents readable in other editors.Read 28 Sep 2026 · usecomposer.md
MCP Standard
MCP lets agents read from and write to shared Composer documents.Read 28 Sep 2026 · usecomposer.md
Private Documents
The free plan allows up to 7 private documents.Read 28 Sep 2026 · usecomposer.md
Pro Private Limits
Pro makes private documents and collaborators unlimited.Read 28 Sep 2026 · usecomposer.md
Public Documents
Free users get unlimited public documents and collaborators.Read 28 Sep 2026 · usecomposer.md
Publishing workflow
noneRead 20 Sep 2026 · usecomposer.md
Real-time collaboration
YesRead 20 Sep 2026 · usecomposer.md
Upload Limit
The free plan has a 10 MB upload limit.Read 28 Sep 2026 · usecomposer.md

Plans and prices

Free Free 7 private documents · 3 collaborators per private document · 10 MB upload limit Up to 7 private documents, 3 collaborators per private document, and a 10 MB upload limit. Read 28 Sep 2026 · usecomposer.md
Pro $7.99 a month billed monthly Unlimited private documents · Unlimited private-document collaborators · Early access to new features Read 20 Sep 2026 · usecomposer.md
Pro Annual $5.99 a month billed annually at $71.88 per year Removes free-plan limits on private documents and collaborators. Read 28 Sep 2026 · usecomposer.md
Pro Monthly $7.99 a month billed monthly at $7.99 per user Removes free-plan limits on private documents and collaborators. Read 28 Sep 2026 · usecomposer.md

Every Composer plan and price →

Strong points and limits

Strong points

  • Real-time multiplayer Markdown editing
  • AI agents collaborate through MCP
  • Changes sync across devices and sessions
  • Unlimited public documents on free plan
  • Plain Markdown supports editor portability

Limits

  • Free private documents capped at seven
  • Free private documents allow three collaborators each
  • Free uploads limited to 10 MB
  • No publishing workflow listed

Who it suits

Composer suits teams and AI agents editing Markdown together in real time. It fits users who want synchronized documents, MCP collaboration, and plain-text portability.

Verdict

Composer focuses on synchronized Markdown collaboration between people and agents. The free tier supports public work and limited private projects, while Pro removes private-document limits and adds early feature access.

Where Specifiction places it

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