Undertone 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.

Undertone compared with Mermaid Viewer
Detail	Undertone	Mermaid Viewer
What it does	See why colors work	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: Original view, Temperature map, Value structure, Saturation map, Palette and Harmony for every image, 20 analyses at a time. Lifetime Premium: one-time purchase includes Composition guides, Contrast map, tinted value bands, unlimited history, full-res export. No subscription.	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	Palette with proportions showing dominant colors sized by image weight Color harmony identification (Complementary, Analogous, Triadic, Split-complementary, Tetradic, Square, Monochromatic) Temperature map showing warm and cool distribution across image Value structure divided into clear zones (light, mid-tone, dark) Saturation map showing vivid and muted areas Composition guides identifying classic guides like golden ratio and rule of thirds Contrast map showing where the eye lands first (Premium) Painter-friendly color names (Yellow Ochre, Payne's Gray, etc.) Local device processing with no image uploads Works offline with no account required	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	Shows color proportions, not just colors, recognizing that a 60/5 split is fundamentally different from 50/50 Four layers of analysis together show relationships single layers cannot reveal Built by people who actually mix paint with painter-friendly vocabulary Lifetime Premium with single payment, no subscription model All data stays on device, no account signup required	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)	8 +1 (up) since last check	6 +1 (up) since last check
Trust Flow (Majestic)	4	3
Citation Flow (Majestic)	32	23
Referring domains (Majestic)	31	12

5 details filled in for both companies.

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