#efc03e as text	Ratio	AA	AA large	AAA	Fix
Aaon white	1.71:1	fail	fail	fail	AA: use #926e0c as the text (4.71:1) AAA: use #6d5209 as the text (7.34:1) AA: or shift the background to #525252 (4.57:1) AAA: or shift the background to #363636 (7.07:1)
Aaon black	12.28:1	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 #efc03e as the background.

Brands using this color

No public brand in the corpus uses this exact color yet. Extract a brand to add one.

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

f25f29 b03a2e f2c14e 14100e f8ede3

Ember

Open in tool →

Flame orange on charcoal — the sports and energy palette; one accent yellow for stats and highlights.

Bold Dark Warm

Fonts for this mood

#efc03e 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 #efc03e

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 #efc03e and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link

tool url/palettes/new/efc03e-c4be9c-62b1cb-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