#ef451a as text	Ratio	AA	AA large	AAA	Fix
Aaon white	3.79:1	fail	pass	fail	AA: use #db380f as the text (4.58:1) AAA: use #a72b0c as the text (7.01:1) AA: or shift the background to #1a1a1a (4.59:1)
Aaon black	5.54:1	pass	pass	fail	AAA: use #f26c4a as the text (7.02:1)

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #ef451a as the background.

Brands using this color

Fonts for this mood

#ef451a 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 #ef451a

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 #ef451a and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/ef451a-c4a99c-62cbad-2d281f-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