Mermaid Viewer vs Claude Designer

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Mermaid Viewer compared with Claude Designer
Detail	Mermaid Viewer	Claude Designer
What it does	Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports	Design templates and visual styles for Claude and Claude Code
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Paid
Pricing	Free: unlimited editor and preview, 3 saved diagrams, 5 AI uses total, PNG export 1× with watermark. Starter: $6.99/month or $69.90/year; 30 saved diagrams, 500 AI conversations per month, PNG export up to 4× without watermark. Pro: $11.99/month or $119.90/year; unlimited diagrams, unlimited AI, PNG	ProDesign Archive: $10 one-time purchase. Individual design kits: $19.90 each, one-time payment. Prices in US dollars (USD).
Key features	Live preview of Mermaid code as you type AI diagram generator, editor and syntax fixer PNG export on every plan; JPG, SVG and PDF on Pro All 22+ Mermaid diagram types supported Share diagrams via public links and embeds Save diagrams to cloud with folders and version history Keyboard shortcuts and autocomplete Mobile-responsive editor with pan and pinch-zoom	Preview complete page templates before purchase Browse 148 free visual styles Search 2,073 design source entities Inspect design across desktop, tablet, and mobile views Download JSON design tokens and CSS files Customize colors, typography, spacing, and components ProDesign Archive with 139 searchable design references Guest checkout and immediate download after payment Access 9 free design planning briefs Claude Rules and component notes included
What makes it different	No account or sign-up required to start editing diagrams Affordable pricing: Starter at $6.99/month, Pro at $11.99/month Diagrams render in your browser; nothing stored unless you choose to save Fast editor with instant rendering and clear error messages	No account required; browse freely and purchase with guest checkout One-time purchase with no subscription Complete visual direction provided; not isolated components or prompts Use resources with Claude, Claude Code, Figma, and existing workflows Independent from Anthropic; not affiliated, endorsed, or sponsored
Community votes	0	0
DR (Domain Rating by Ahrefs)	6 +1 (up) since last check	16 −1 (down) since last check
Trust Flow (Majestic)	3	5
Citation Flow (Majestic)	23	16
Referring domains (Majestic)	12	58

5 details filled in for both companies.

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