Simple pricing
Start free with the full editor. Upgrade when you need unlimited diagrams or want AI agents to work with your diagrams.
Free
Everything you need to build, export and share Mermaid diagrams.
$0 / month
- Full web app: visual canvas and code editor
- Every Mermaid diagram type
- PNG and SVG export, share links and embeds
- Save up to 50 diagrams to your account
Pro
For AI workflowsFor heavy users and teams who work with AI agents.
$9 / month
- Everything in Free
- Unlimited saved diagrams
- AI diagram generator: describe it, get Mermaid (50 a day)
- MCP connectors: let AI agents like Claude create and edit your diagrams
- Priority email support
Prices in US dollars. Payments are non-refundable; see the refund policy.
What is actually different
The Free plan is the whole editor, not a trial. Pro lifts the saved-diagram limit and opens the account to AI agents.
| Feature | Free | Pro |
|---|---|---|
| Visual canvas and code editor | Everything | Everything |
| Diagram types | All of them | All of them |
| PNG and SVG export | Yes | Yes |
| Share links and embeds | Yes | Yes |
| Diagrams saved to your account | Up to 50 | Unlimited |
| AI diagram generator | No | 50 a day |
| MCP connectors for AI agents | No | Yes |
| API keys | No | Yes |
| Support | Priority email |
How Mermaid pricing compares
Mermaid itself costs nothing: the library and the official Live Editor are open source. You only pay for hosted extras such as saved diagrams, AI and collaboration.
| Product | Free | Paid | Billing |
|---|---|---|---|
| Mermaid.js library | Everything (MIT licence) | None | — |
| Mermaid Live Editor | Full editor, no accounts | None | — |
| mermaid.ai (formerly Mermaid Chart) | 3 diagrams, 15 AI credits | Plus $10, Premium $20 per user / month | Annual only |
| TryMermaid | Full editor, 50 saved diagrams | Pro $9 / month | Monthly |
Prices checked on each vendor’s pricing page on 29 October 2026.
Weighing this against other tools? We compared seven Mermaid editors and their prices, and wrote up how to generate diagrams with Claude over the MCP connector.
Pricing questions
Do I need to pay to use TryMermaid?
No. Anyone can sign up for free and use the whole web app. The Free plan lets you save up to 50 diagrams to your account, and you can keep editing, exporting and sharing without saving at all.
What happens when I reach 50 diagrams?
Your existing diagrams stay safe and editable. To save a new one, delete a diagram you no longer need or upgrade to Pro for unlimited diagrams.
What are MCP connectors?
MCP (Model Context Protocol) connectors let AI agents such as Claude, Cursor and other MCP clients work with TryMermaid directly: create diagrams from a prompt, update saved diagrams and read them back, all in your account.
What is the AI diagram generator?
Describe a diagram in plain words on the AI Mermaid generator page and get Mermaid code back, checked by the Mermaid parser before you see it. Pro includes 50 generations a day. All the other tools on the tools page, such as the PDF export, the validator and the SQL to ER converter, are free.
Can I cancel at any time?
Yes. Cancel whenever you like and you keep Pro until the end of the billing period you have paid for. After that your account moves to the Free plan and no diagrams are deleted.
Do you offer refunds?
No. Payments are non-refundable, including partial months, except where the law requires otherwise. Read the refund policy for the details.
Is there a free trial of Pro?
The editor is free and needs no account, so the quickest answer is to try it. The Free plan is the whole application, not a trial: every diagram type, the drag-and-drop canvas, PNG and SVG export, share links and embeds. Pro only adds unlimited saved diagrams, the AI diagram generator and MCP connectors.
Can I take my diagrams with me if I stop paying?
Yes. Everything you build is standard Mermaid code, and export gives you PNG, SVG or the code itself. Nothing is stored in a format only TryMermaid can read, so you are never locked in.
How is payment handled?
Payments are handled by Lemon Squeezy, which acts as merchant of record. Card details never reach TryMermaid. You can change your card or cancel at any time from the billing portal linked in your dashboard.