BlockPoster.ai 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.

BlockPoster.ai compared with Mermaid Viewer
Detail	BlockPoster.ai	Mermaid Viewer
What it does	Free block poster maker for turning photos or AI art into wall-sized prints	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	HK	Not given
Pricing model	Freemium	Freemium
Pricing	Free: basic PDF export up to 150 DPI with watermark. Starter $4.99/month with 20 AI credits, unlimited HD PDFs. Creator $19.99/month with 200 AI credits, unlimited HD PDFs. Studio $39.99/month with 1,000 AI credits, unlimited HD PDFs. One-time options: $4.99 with 1 source-image unlock and 2 AI credi	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	Upload photos or generate AI artwork Choose from five paper sizes Crop and adjust margins and overlap Preview layout before downloading Free and paid export options Batch processing of multiple images Save and reuse print presets	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	Private photo processing stays on your device Full-featured free edition without account Works with ordinary home printer paper AI generation integrated directly in workspace Clear separation of credits and unlocks	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)	31 +2 (up) since last check	6 +1 (up) since last check
Trust Flow (Majestic)	15	3
Citation Flow (Majestic)	30	23
Referring domains (Majestic)	37	12

5 details filled in for both companies.

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