#b30021 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	7.15:1	pass	pass	pass	Passes AAA — no fix needed.
Aaon black	2.94:1	fail	fail	fail	AA: use #eb002b as the text (4.57:1) AAA: use #ff5c7a as the text (7.06:1) AA: or shift the background to #cfcfcf (4.59:1) AAA: or shift the background to #ffffff (7.15:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #b30021 as the background.

Brands using this color

Twilioaccent · #b10f23 · Δ0.671

Fonts for this mood

#b30021 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:

Warm fonts →Playful fonts →Bold fonts →

mcpConnect your agent — build around #b30021

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 #b30021 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/b30021-c49c9f-62cb85-2d231f-f1e9ee?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