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'.
Color
#efc139
#efc139
hex
#efc139rgb
rgb(239, 193, 57)hsl
hsl(45, 85%, 58%)oklch
oklch(0.83 0.153 89)Closest name: Amber (#ffbf00)Relative luminance 0.5679
Colors that go with #efc139
Charcoal, Cornflower Blue and Deep Sky Blue lead the list. Each partner is a real named colour with the reason it works — a wheel relationship, a neutral that carries it, or a pairing lifted from a palette or brand system that actually shipped — and every pair opens in the palette tool.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #efc139: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Cornflower Blue #6495ed
complementaryshippedCornflower Blue sits directly opposite #efc139 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Deep Sky Blue #00bfff
split-complementshippedDeep Sky Blue is a split-complement of #efc139: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Champagne #f7e7ce
shipped4 real palettes, including Coffee Bar and Midnight Luxe put Champagne beside #efc139, as that palette's text colour.
Crimson #dc143c
shippedCrimson is paired with #efc139 in 7 real palettes, including McDonald's's brand system and Tabloid, as the supporting colour.
Dark Olive Green #556b2f
shippedDark Olive Green shows up next to #efc139 in 4 real palettes, including Farmers Market and Miro's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #efc139: 11 real palettes, including Wikipedia's brand system and Walmart's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #efc139: 6 real palettes, including Google's brand system and Heatwave, as the lead colour.
Real palettes that use #efc139
Tints & shades
Harmonies
Contrast
| #efc139 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.7:1 | fail | fail | fail | |
Aaon black | 12.36:1 | 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 #efc139 as the background.
Brands using this color
Palettes built around it
Trailhead
Open in tool →Rust, pine and sun — high-visibility earth tones that read at a distance and on a trail sign.
Ember
Open in tool →Flame orange on charcoal — the sports and energy palette; one accent yellow for stats and highlights.
Fonts for this mood
#efc139 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #efc139
live endpointPoint any MCP client at the shared colors endpoint and your agent gets the same engine as this page — direct_palette, edit_direction, check_palette, check_contrast — read-only, no key. Every direction it proposes comes with a /colors/d/… link: open it, lock what you like, paste the link back, and the agent edits rather than re-rolls.
endpoint
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
try this prompt
›analyze #efc139 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/efc139-c4be9c-62afcb-2b2d1f-f1ebe9?lock=0&style=vibrantWant the agent to remember your picks and write them into a living brand? Create a free BrandSweets workspace.
Machine-readable: color.md