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
#ff4b2b
#ff4b2b
hex
#ff4b2brgb
rgb(255, 75, 43)hsl
hsl(9, 100%, 58%)oklch
oklch(0.667 0.221 32.4)Closest name: orangered (#ff4500)Relative luminance 0.2647
Colors that go with #ff4b2b
Charcoal, Cadet Blue and Amber 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 #ff4b2b: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Cadet Blue #5f9ea0
complementaryshippedCadet Blue sits directly opposite #ff4b2b on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Amber #ffbf00
shippedAmber is paired with #ff4b2b in 7 real palettes, including Heatwave and Ember, as the supporting colour.
Blue #0000ff
shipped7 real palettes, including Monzo's brand system and Readymag's brand system put Blue beside #ff4b2b, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #ff4b2b: 4 real palettes, including Tide's brand system and NASA's brand system, as the lead colour.
Crimson #dc143c
shippedCrimson is paired with #ff4b2b in 8 real palettes, including Pizza Hut's brand system and Wise's brand system, as the supporting colour.
Denim #1560bd
shippedDesigners have shipped Denim with #ff4b2b: 14 real palettes, including Strava's brand system and Soundcloud's brand system, as the accent.
Dodger Blue #1e90ff
shippedDesigners have shipped Dodger Blue with #ff4b2b: 7 real palettes, including Heatwave and Readymag's brand system, as the accent.
Real palettes that use #ff4b2b
Tints & shades
Harmonies
Contrast
| #ff4b2b as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.34:1 | fail | pass | fail | |
Aaon black | 6.29:1 | pass | pass | fail |
|
Fixes keep hue and saturation and move lightness only, so the suggestion stays on-brand. Ratios are symmetric: the same numbers apply with #ff4b2b as the background.
Brands using this color
Palettes built around it
Fonts for this mood
#ff4b2b reads as warm, vivid, playful. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #ff4b2b
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 #ff4b2b and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/ff4b2b-c4a79c-62cba8-2d271f-f1e9ec?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