Heatwave
Open in tool →Blaze orange and hot yellow with one cold blue — the high-noon palette; use the blue where the eye needs to rest.
Color
#feb21b
#feb21b
hex
#feb21brgb
rgb(254, 178, 27)hsl
hsl(40, 99%, 55%)oklch
oklch(0.815 0.166 76.8)Closest name: Baklava (#efb435)Relative luminance 0.5299
Colors that go with #feb21b
Charcoal, Deep Sky Blue and Champagne 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 #feb21b: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Deep Sky Blue #00bfff
complementaryshippedDeep Sky Blue sits directly opposite #feb21b on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Champagne #f7e7ce
shipped4 real palettes, including Coffee Bar and Midnight Luxe put Champagne beside #feb21b, as that palette's text colour.
Cornflower Blue #6495ed
shippedDesigners have shipped Cornflower Blue with #feb21b: 6 real palettes, including Mastodon hosted on mastodon.social's brand system and Blueprint, as the supporting colour.
Crimson #dc143c
shippedCrimson is paired with #feb21b in 8 real palettes, including Tequila Sunrise and McDonald's's brand system, as the lead colour.
Dark Olive Green #556b2f
shippedDark Olive Green shows up next to #feb21b in 4 real palettes, including Farmers Market and Undergrowth, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #feb21b: 11 real palettes, including Wikipedia's brand system and Gopro's brand system, as the supporting colour.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #feb21b: 7 real palettes, including Heatwave and Google's brand system, as the accent.
Real palettes that use #feb21b
Tints & shades
Harmonies
Contrast
| #feb21b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 1.81:1 | fail | fail | fail | |
Aaon black | 11.6:1 | 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 #feb21b as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#feb21b reads as warm, vivid, playful. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #feb21b
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 #feb21b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/feb21b-c4bb9c-62b8cb-2c2d1f-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