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
#f5c538
#f5c538
hex
#f5c538rgb
rgb(245, 197, 56)hsl
hsl(45, 90%, 59%)oklch
oklch(0.843 0.157 88.7)Closest name: Amber (#ffbf00)Relative luminance 0.5963
Colors that go with #f5c538
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 #f5c538: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Cornflower Blue #6495ed
complementaryshippedCornflower Blue sits directly opposite #f5c538 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 #f5c538: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Crimson #dc143c
shippedCrimson is paired with #f5c538 in 8 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 #f5c538 in 4 real palettes, including Farmers Market and Miro's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #f5c538: 11 real palettes, including Walmart's brand system and McDonald's's brand system, as the lead colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #f5c538: 5 real palettes, including Google's brand system and Heatwave, as the lead colour.
Medium Sea Green #3cb371
shippedMedium Sea Green is paired with #f5c538 in 4 real palettes, including Olympics's brand system and Mint Modern, as the accent.
Real palettes that use #f5c538
Tints & shades
Harmonies
Contrast
| #f5c538 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.62:1 | fail | fail | fail | |
Aaon black | 12.93:1 | 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 #f5c538 as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#f5c538 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #f5c538
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 #f5c538 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/f5c538-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