BlockPoster.ai vs Diagram Smith

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 Diagram Smith
Detail	BlockPoster.ai	Diagram Smith
What it does	Free block poster maker for turning photos or AI art into wall-sized prints	Free online tools for flowcharts, charts, diagrams and timelines with no sign-up
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: no account required, all diagram and chart makers, PNG/SVG/PDF export, no watermark. Pro: Monthly $9.99 a month, Yearly $99.99 a year with 7-day free trial, Lifetime $239.99 once. Euro area: €10.99 a month, €109.99 a year, €259.99 once (VAT included).
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	Flowchart and process diagram maker with canvas and text-to-diagram modes Text-to-diagram tools for UML, ER and sequence diagrams Chart tools: pie chart, line graph, gauge and Sankey diagram Automatic diagram layout from typed text Export to PNG, SVG and PDF without watermark Share diagrams with share links Pro: editable .drawio export and vector PDF Pro: multi-page documents and layers Diagram checks for unlabelled branches and dead ends Works on phone and computer
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	Completely free with no account required and no watermark on exports Nothing uploaded: all work stays on your device in your browser Results computed by the same tested code, not manually typed Multiple export formats: PNG at 4 sizes, SVG and PDF Converts between formats: Mermaid to draw.io, SQL to ER, Visio to flowchart
Community votes	0	0
DR (Domain Rating by Ahrefs)	32 +1 (up) since last check	3 +1 (up) since last check
Trust Flow (Majestic)	15	0
Citation Flow (Majestic)	30	19
Referring domains (Majestic)	37	4

5 details filled in for both companies.

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