#666b66 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	5.44:1	pass	pass	fail	AAA: use #555855 as the text (7.21:1)
Aaon black	3.86:1	fail	pass	fail	AA: use #737873 as the text (4.66:1) AAA: use #949994 as the text (7.24:1) AA: or shift the background to #ebebeb (4.56:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #666b66 as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

Palettes built around it

1b1b1b 6e6e6e 1e40af fcfbf7

Ink & Paper

Open in tool →

Two greys and one ink-blue link color: the palette of a well-set book page.

Minimal Editorial Clean

Fonts for this mood

#666b66 reads as neutral, minimal. The font library is tagged with the same vocabulary:

Neutral fonts →Minimal fonts →

mcpConnect your agent — build around #666b66

live endpoint

Point any MCP client at the shared colors endpoint and your agent gets the same engine as this page — generate_palette, check_contrast, analyze_color — read-only, no key. Every palette it proposes comes with a /palettes/new/… link: open it, lock what you like, paste the link back.

endpointhttps://mcp.brandsweets.com/colors/mcp

claude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp

try this prompt

›analyze #666b66 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/666b66-a2beb0-c859d4-1f2d2b-eaf1e9?lock=0&style=vibrant

Want the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.

Machine-readable: color.md