StampZen vs Mermaid Viewer

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

StampZen compared with Mermaid Viewer
Detail	StampZen	Mermaid Viewer
What it does	Free online stamp maker for custom stamps and seals	Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Freemium
Pricing	Free: unlimited design edits and 480px watermarked JPG download. Paid: High-res PNG $2.50, PNG + SVG $2.90, All formats (PNG + SVG + PDF) $3.50. No subscription, one-time payment only.	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
Key features	26 stamp template categories including company seals, notary, date, and deposit stamps Round, square, or rectangular stamp shapes sized in real millimeters Live preview rendering as you edit Free watermarked JPG download to test layout High-resolution PNG export at 6000px with transparent background Vector SVG export with text converted to outlines for stamp makers Print-ready PDF at true physical size Mobile-responsive web app with no installation required Customizable fonts including Oswald, Archivo, PT Serif, Courier Prime, and Noto Sans CJK Adjustable ink color, opacity, aging effect, and border styles	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
What makes it different	No account creation or signup required to design and download free preview Pay once per design, no subscription billing Server-side rendering ensures preview matches final export exactly Designed specifically for real documents with print-ready output at true size Seven-day email download link for file re-downloads after payment	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
Community votes	0	0
DR (Domain Rating by Ahrefs)	11 no change since last check	6 +1 (up) since last check
Trust Flow (Majestic)	6	3
Citation Flow (Majestic)	22	23
Referring domains (Majestic)	10	12

5 details filled in for both companies.

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