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Composer
What it is
Composer is a web-based, real-time multiplayer Markdown editor for people and AI agents. Teammates edit shared documents together, while agents connect through MCP and join as collaborators. MCP allows agents to read from and write to shared Composer documents. Changes synchronize across teammates, devices, and sessions. Composer uses plain Markdown, keeping documents readable in other editors, and supports Markdown export. The listed publishing workflow is none. The free plan includes 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 costs $7.99 a month when billed monthly or $5.99 a month billed annually at $71.88 a year. Users can cancel anytime; Stripe handles checkout.
For and against
For
- Real-time multiplayer editing
- Agents join as document collaborators
- Plain Markdown remains portable
- Changes sync across devices and sessions
- Free plan includes unlimited public documents
Against
- Free private documents limited to seven
- Free uploads capped at 10 MB
- No listed publishing workflow
- Paid plans are user-billed
The verdict
Composer focuses on synchronized Markdown collaboration between people and agents. Its free limits are clear, while Pro expands private collaboration and adds early feature access.
Who it suits
Composer suits teams sharing Markdown documents in real time and people working with AI agents through MCP. The free plan fits limited private collaboration or unlimited public documents.
Plans and prices
Free
7 private documents · 3 collaborators per private document · 10 MB upload limit
Read 28 Sep 2026 · usecomposer.md
Pro
Unlimited private documents · Unlimited private-document collaborators · Early access to new features
Read 20 Sep 2026 · usecomposer.md
Pro Annual
Read 28 Sep 2026 · usecomposer.md
Pro Monthly
Read 28 Sep 2026 · usecomposer.md
On the record
- Agent Collaboration
- Agents join documents as true collaborators.usecomposer.md · read 28 Sep 2026
- Agent Connection
- AI agents connect to Composer over MCP.usecomposer.md · read 28 Sep 2026
- Billing Provider
- Checkout is handled by Stripe.usecomposer.md · read 28 Sep 2026
- Cancellation Policy
- Users can cancel anytime, with the plan active through the paid period.usecomposer.md · read 28 Sep 2026
- Cloud sync
- Yesusecomposer.md · read 20 Sep 2026
- Real-time collaboration
- Yesusecomposer.md · read 20 Sep 2026
- Change Sync
- Changes sync across teammates, devices, and sessions.usecomposer.md · read 28 Sep 2026
- Editor Type
- Composer is a real-time, multiplayer Markdown editor for people and agents.usecomposer.md · read 28 Sep 2026
- Export formats
- Markdownusecomposer.md · read 20 Sep 2026
- Free Collaborators
- Each free private document supports up to 3 collaborators.usecomposer.md · read 28 Sep 2026
- Free Plan
- Composer offers a free plan to get started.usecomposer.md · read 28 Sep 2026
- Private Documents
- The free plan allows up to 7 private documents.usecomposer.md · read 28 Sep 2026
- Upload Limit
- The free plan has a 10 MB upload limit.usecomposer.md · read 28 Sep 2026
- Markdown Compatibility
- Composer uses plain Markdown, keeping documents readable in other editors.usecomposer.md · read 28 Sep 2026
- MCP Standard
- MCP lets agents read from and write to shared Composer documents.usecomposer.md · read 28 Sep 2026
- Early Feature Access
- Pro includes early access to new features.usecomposer.md · read 28 Sep 2026
- Pro Private Limits
- Pro makes private documents and collaborators unlimited.usecomposer.md · read 28 Sep 2026
- Public Documents
- Free users get unlimited public documents and collaborators.usecomposer.md · read 28 Sep 2026
