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Most buyers should pick draw.io.
Pick draw.io if you want free diagramming with unlimited diagrams and users, no account required, and flexible storage or embedding. Choose Mermaid Chart if you want AI-assisted creation, Mermaid syntax, visual editing, and live collaboration. draw.io has a free plan; Mermaid Basic is also free, but its listed diagram cap conflicts: the plan overview says three diagrams, while the comparison table says up to six. Paid Mermaid plans are annual-only, starting at $10 per user monthly.
01Side by side
| draw.io | Mermaid Chart | |
|---|---|---|
| Starting price | Free; Cloud paid tiers start at $5 or $20 | $10/user/month; annual billing only |
| Free plan | Unlimited diagrams and users; no account required | Basic; 3 or 6 diagrams, 15 AI credits |
| Best for | Free diagramming, flexible storage, and embedding | AI, Mermaid syntax, and visual editing |
| Core strength | File compatibility and cross-platform editing | AI generation, code, and live collaboration |
| Learning curve | No account required; diagram editor | Syntax, AI prompts, or visual editor |
| Integrations/data | Choose storage; embed diagrams; Confluence and Jira cloud | MCP server for Claude, VS Code, and Cursor |
| Team/seat costs | Free unlimited users; Cloud free up to 10 | Paid per user; Premium includes free viewer seats |
| Support | Review score: 5/10 | Review score: 5/10 |
draw.io Choose draw.io if
- Choose draw.io if you need unlimited free diagrams and users.
- Choose draw.io if you want to store data where you choose.
- Choose draw.io if you need interactive diagram embeds.
Mermaid Chart Choose Mermaid Chart if
- Choose Mermaid Chart if you want AI-generated diagrams.
- Choose Mermaid Chart if you prefer Mermaid syntax or visual editing.
- Choose Mermaid Chart if you need its MCP server integrations.
02Pricing compared
Both products have a free option, but the limits and paid plans differ. draw.io’s Free plan for diagrams.net Online and Desktop lists unlimited diagrams and users, with no account required. For Confluence and Jira Cloud, pricing is monthly: the pricing page says it is free for up to 10 users, with paid tiers starting at $5 or $20, depending on product or tier. Annual pricing is not published. Its Atlassian Data Center option starts at $6,000 per year and 500 users.
Mermaid Chart’s Basic plan is free, but its diagram cap is unclear: the plan overview says three diagrams, while the comparison table says up to six. Paid plans are annual-only: Plus is $10 per user per month, billed annually, and Premium is $20. Plus and Premium include unlimited diagrams; Premium adds unlimited free viewer seats and unlimited teams and project creation.
03Features and depth
The main difference is how you create diagrams. draw.io is a general-purpose diagramming app: you can build diagrams, collaborate using shared cursors, and choose where to store your data. It supports interactive embeds in documents, wikis, or applications, and exports to SVG, PNG, or PDF. Its files remain editable, and the product says files created in 2005 still load in today’s app.
Mermaid Chart combines a visual editor with Mermaid syntax and AI-assisted creation. Its listed AI features create diagrams from prompts, documents, or transcripts; users can also write Mermaid code and connect shapes to source code. The editor supports click-based adjustments, node alignment, and edge reattachment. Both products support real-time collaboration, but Mermaid Chart also lists link sharing and an MCP server for generating, validating, and rendering diagrams from Claude, VS Code, and Cursor. It lists flowcharts, sequence diagrams, timelines, and ER diagrams among its diagram types.
04Ease of use and learning curve
For a quick start without an account, draw.io has the simpler proposition: its free Online and Desktop plan lists unlimited diagrams and users. Its flexible storage options may also suit teams that want to choose where their files live. The published material does not specify a required coding workflow.
Mermaid Chart gives users a choice of AI prompts, Mermaid syntax, or visual editing. That range can suit both people who prefer code and those who would rather adjust diagrams visually, but teams using syntax will need to learn it. Its free Basic plan also has a diagram-cap discrepancy in the listed materials, so check the current plan details before relying on the free allowance.
Questions people ask
Is draw.io completely free?
The diagrams.net Online and Desktop Free plan lists unlimited diagrams and users, with no account required. Paid options are listed for Confluence and Jira Cloud, where pricing starts at $5 or $20 depending on product or tier, and for Atlassian Data Center, which starts at $6,000 per year.
Is Mermaid Chart free to use?
Mermaid Chart has a free Basic plan. Its plan overview lists three diagrams, while its comparison table says up to six, so the published diagram limit conflicts. Basic also lists a diagram-size limit of 60, 15 AI credits, and one team and project creation.
Which is better for AI-generated diagrams?
Mermaid Chart is the one with listed AI diagram generation from prompts, documents, or transcripts. Its feature list also includes an MCP server for generating, validating, and rendering diagrams from Claude, VS Code, and Cursor. The published draw.io features do not list AI generation.
Can teams collaborate in both tools?
Yes. draw.io lists real-time collaboration with shared cursors. Mermaid Chart lists live co-editing and link sharing. Mermaid Chart’s Premium plan also includes unlimited free viewer seats; draw.io’s free plan lists unlimited users. The sources do not specify identical collaboration controls or permissions across plans.