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FreeOGImage 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.

FreeOGImage compared with Mermaid Viewer
DetailFreeOGImage logo FreeOGImageMermaid Viewer logo Mermaid Viewer
What it doesFree Open Graph image generator with no signup, no watermark, and no data uploads Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFree Freemium
PricingNot given 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
  • 224+ customizable templates across product, editorial, developer, gaming, and more
  • Full browser-based editing with no server uploads
  • Pixel-exact exports at 2× resolution for high-DPI screens
  • Support for multiple platform sizes: Open Graph, X, LinkedIn, Facebook, Square
  • Deep customization controls for backgrounds, gradients, typography, logos, and effects
  • No signup, no watermark, no account required
  • Local storage saves designs only to your device
  • 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
  • Genuinely free with no hidden paywalls or upgrade requirements
  • Privacy by architecture—no backend, no servers, no data collection
  • Maintained by independent developer with transparent editorial standards
  • 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 votes00
DR (Domain Rating by Ahrefs)28 −1 (down) since last check6 +1 (up) since last check
Trust Flow (Majestic)203
Citation Flow (Majestic)1923
Referring domains (Majestic)13312

4 details filled in for both companies.

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