Free live Mermaid diagram editor with no signup required
Your design system enforced
Stage
Not given
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Founded
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Based in
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Pricing model
Free
Freemium
Pricing
Not given
Free: €0 forever for one design system with tokens, components, assets, MCP endpoint, Figma import and sync, live documentation site, and drift checks inside the app. Studio: €15 per seat per month with up to 5 design systems, 10 contexts and API keys, 3 connected repositories, enforcement on every
Key features
Live preview as you type
21 diagram types including flowcharts, sequence, class, state, ER, Gantt, git graph, mindmap and timeline
Two-way editing for flowcharts
SVG and PNG export
Share diagrams as URLs with embedded diagram content
Built-in template picker and cheatsheet
No account or signup required
Works entirely in browser with local storage
Open Mermaid Live Editor links
Mermaid v11 syntax support
Reads Figma variables and styles plus repository code to build one clear picture of your design system
Serves design system to Claude Code, Cursor and Copilot through secure MCP connection
Generates editor rule files automatically
Live documentation with auto-synced token blocks
Source code never leaves your repository
Separate space and connection for each design system or client
Configurable rule strictness with errors blocking merges and warnings letting them through
Multiple connected repositories and contexts per plan
What makes it different
No signup, paywall, or data collection required
Diagrams stay in your browser's local storage by default
Two-way editing that updates code when you edit the canvas
Live preview with no render button required
Clean SVG export for professional use in docs and slides
Reconciles Figma design files with actual repository code into one unified source of truth
Ranks tokens by actual usage instead of showing raw Figma values
Catches design system mismatches before code merges, not just in reviews
Works through MCP protocol so compatible with multiple AI tools not just one
FlowViz
Contexxt