#643f5b as text	Ratio	AA	AA large	AAA	Fix
Aaon white	8.74:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	2.4:1	fail	fail	fail	AA: use #9d628e as the text (4.57:1) AAA: use #b488a9 as the text (7.04:1) AA: or shift the background to #bababa (4.5:1) AAA: or shift the background to #e8e8e8 (7.13:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #643f5b as the background.

Brands using this color

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

Fonts for this mood

#643f5b reads as warm, muted, editorial. The font library is tagged with the same vocabulary:

Warm fonts →Editorial fonts →Elegant fonts →

mcpConnect your agent — build around #643f5b

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 #643f5b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/643f5b-c19fb4-7bcb62-2d1f24-efe9f1?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