#f4cb01 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	1.57:1	fail	fail	fail	AA: use #897201 as the text (4.7:1) AAA: use #655501 as the text (7.36:1) AA: or shift the background to #575757 (4.61:1) AAA: or shift the background to #3b3b3b (7.14:1)
Aaon black	13.39:1	pass	pass	pass	Passes AAA — no fix needed.

Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #f4cb01 as the background.

Brands using this color

Gumroadaccent · #ffc900 · Δ1.725

Palettes built around it

e11d48 111111 facc15 ffffff

Tabloid

Open in tool →

Red, black and yellow on white is the loudest three-color system in print — use it when headlines are the product.

Editorial Bold Vivid

Fonts for this mood

#f4cb01 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 #f4cb01

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 #f4cb01 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/f4cb01-c4c29c-4eacdf-292d1f-f1ece9?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