Zovo Palette Lab

io.github.theluckystrike/contrast-checker · v1.0.0

New (7 days)

Measured by MCP Station

Last check	Reachable
Checked at	—
Check success 7 / 30 days	—
First-try success 30 days	—
Median response	—
Lookups 30 days	—
Authentication	No auth
MCP version	2025-06-18
Rank score	—
Declared risk	Read-only (all tools declare readOnlyHint)
Capabilities declared	resources, tools
Tool definitions	3 tools · with description 100% · input schema is an object 100% · read/destructive hints 100%

WCAG contrast & palettes

streamable-http · https://contrast-checker.zovo.one/mcp

claude mcp add --transport http contrast-checker https://contrast-checker.zovo.one/mcp

{
  "mcpServers": {
    "contrast-checker": {
      "url": "https://contrast-checker.zovo.one/mcp"
    }
  }
}

check_color_contrast
Use this when the user wants to know whether a text, icon or border colour has enough contrast against a background: a WCAG contrast checker for one colour pair (e.g. "does white text on #F59E0B pass WCAG AA", "contrast ratio of #767676 on white", "what text color for this background"). Returns the
check_palette_contrast
Use this when the user has a colour palette (2 to 12 colours) and wants to know which combinations are accessible: "check contrast of my color palette", "which of these colors can I use for text", "accessible color palette checker". Returns the full pairwise WCAG 2.x contrast matrix (ratios truncate
generate_accessible_palette
Use this when the user wants an accessible colour scale or palette built from one colour: "color palette generator from hex", "generate a 50-950 scale from #1E6FD9", "tailwind color palette generator", "accessible color palette for my website". Builds an 11-step 50-950 tonal scale in OKLCH with the

Website · JSON · Text for agents · Registry updated 2026-10-22