#b91c04 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	6.5:1	pass	pass	fail	AAA: use #af1a04 as the text (7.07:1)
Aaon black	3.23:1	fail	pass	fail	AA: use #e62305 as the text (4.61:1) AAA: use #fb6750 as the text (7.16:1) AA: or shift the background to #d9d9d9 (4.61:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #b91c04 as the background.

Brands using this color

Datadogaccent · #bf0000 · Δ1.646

Palettes built around it

b91c1c 78716c d97706 f5f1ea 1c1917

Newsprint

Open in tool →

Ink-black on warm paper with a single red — the broadsheet hierarchy that lets typography lead.

Editorial Muted Warm

Fonts for this mood

#b91c04 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 #b91c04

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 #b91c04 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/b91c04-c4a69c-62cba6-2d271f-f1e9ec?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