#4b91ce as text	Ratio	AA	AA large	AAA	Fix
Aaon white	3.37:1	fail	pass	fail	AA: use #327ab8 as the text (4.55:1) AAA: use #255a88 as the text (7.25:1) AA: or shift the background to #242424 (4.61:1)
Aaon black	6.24:1	pass	pass	fail	AAA: use #5f9dd3 as the text (7.25:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #4b91ce as the background.

Brands using this color

Retoolaccent · #518dd2 · Δ1.45

Fonts for this mood

#4b91ce reads as cool, modern. The font library is tagged with the same vocabulary:

Modern fonts →

mcpConnect your agent — build around #4b91ce

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 #4b91ce and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/4b91ce-9cadc4-df4e51-1f212d-e9f1f1?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