#fcbf31 as text	Ratio	AA	AA large	AAA	Fix
Aaon white	1.66:1	fail	fail	fail	AA: use #9c6e02 as the text (4.52:1) AAA: use #745102 as the text (7.19:1) AA: or shift the background to #545454 (4.56:1) AAA: or shift the background to #383838 (7.06:1)
Aaon black	12.64:1	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 #fcbf31 as the background.

Brands using this color

Lemon Squeezyprimary · #fcc434 · Δ1.194

Palettes built around it

38bdf8 818cf8 fbbf24 0f172a e2e8f0

Blueprint

Open in tool →

Cyan and indigo on navy is the developer-tool look; amber is the only warm note, so it always reads as 'attention'.

Technical Cool Modern Dark

c2410c 365314 fbbf24 f4efe6 1f1a12

Trailhead

Open in tool →

Rust, pine and sun — high-visibility earth tones that read at a distance and on a trail sign.

Warm Bold VividOutdoors

Fonts for this mood

#fcbf31 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 #fcbf31

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 #fcbf31 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/fcbf31-c4bc9c-62b4cb-2b2d1f-f1ebe9?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