HowHeight 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.

HowHeight compared with Mermaid Viewer
Detail	HowHeight	Mermaid Viewer
What it does	Visual height comparison tool for people, animals, objects, and characters	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 plan available with limited features. HowHeight Pro plans: Monthly $4.99, Quarterly $9.99 per 3 months (with permanent unlock of more object placements), Yearly $29.99 per year (with permanent unlock and lifetime compression after 7-day trial ends and annual payment succeeds).	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	Visual height comparison on a shared baseline scale Support for centimeters and feet plus inches measurements Compare people, celebrities, animals, objects, and fantasy characters Save comparison boards with Pro subscription Export comparisons as PNG images Create shareable links for comparison boards 1,000+ built-in asset references Custom names and editable entries Ad-free workspace with Pro subscription Unlimited objects on boards with Pro subscription	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	Over 1,000 built-in asset references with celebrity presets for instant comparisons Single shared baseline makes height differences proportional and easy to understand at a glance Simple three-step workflow with no signup required for basic use Export and share results as PNG images or shareable links	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)	26 −1 (down) since last check	6 +1 (up) since last check
Trust Flow (Majestic)	21	3
Citation Flow (Majestic)	39	23
Referring domains (Majestic)	218	12

5 details filled in for both companies.

More alternatives to HowHeight More alternatives to Mermaid Viewer