Mermaid Viewer vs GitHubCard

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 GitHubCard
Detail	Mermaid Viewer	GitHubCard
What it does	Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports	Drag-and-drop GitHub profile README generator
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Freemium	Freemium
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	Free for all core features. Pro Lifetime: $19 USD one-time payment for premium backgrounds, premium fonts, watermark-free exports, and 4x PNG exports.
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	20+ draggable widgets including stats, heatmaps, streaks, and language cards GitHub stats cards, contribution heatmaps, commit streaks, language and stack snapshots, top languages cards, top repositories, and star history Real-time data from GitHub with automatic caching SVG and PNG export Canvas editor with drag-and-drop interface Global theme settings for background and typography Stable published links that never change Sign in with GitHub to save and manage designs Profile card and repository card types
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	Single link replaces multiple embeds and services in README files Unified visual system keeps profile, repository, and stats pieces cohesive Fewer dependencies and automatic updates reduce maintenance overhead One canvas handles layout, data, and widgets instead of splitting across tools One-time $19 payment with no subscription required
Community votes	0	0
DR (Domain Rating by Ahrefs)	6 +1 (up) since last check	4 no change since last check
Trust Flow (Majestic)	3	4
Citation Flow (Majestic)	23	21
Referring domains (Majestic)	12	33

5 details filled in for both companies.

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