Mermaid Viewer vs Voilà Charts

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 Voilà Charts
Detail	Mermaid Viewer	Voilà Charts
What it does	Free online Mermaid diagram viewer and editor with live preview, AI generation, and exports	Not given
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: 10 charts, all chart types and styles, no account required. Launch license: $14.99 one-time payment for unlimited charts, custom logo, and no Voilà mark. $19.99 after the first 100 licenses.
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	Automatic chart type detection from data Support for links, screenshots, CSV, Excel and text files Bar, line, pie and combo charts Compare two data sources on one chart Custom branding with logo and color palettes One-click customization of chart elements Export and save charts No data collection or cloud storage
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	Instantly create professional charts by pasting a link or table One-time purchase with no subscription required All data processing happens locally on your Mac Pre-styled charts that require no design skills Ten free charts before requiring a license
Community votes	0	1
DR (Domain Rating by Ahrefs)	8 +1 (up) since last check	28 +9 (up) since last check
Trust Flow (Majestic)	3	35
Citation Flow (Majestic)	23	35
Referring domains (Majestic)	12	146

4 details filled in for both companies.

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