Retro Pop
Open in tool →Fifties-diner red and steel blue with a peach — nostalgic pop that still passes contrast.
Color
#ef3942
#ef3942
hex
#ef3942rgb
rgb(239, 57, 66)hsl
hsl(357, 85%, 58%)oklch
oklch(0.627 0.217 23.9)Closest name: Angry Flamingo (#f04e45)Relative luminance 0.2167
Colors that go with #ef3942
Charcoal, Dodger Blue and Steel 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 #ef3942: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Dodger Blue #1e90ff
triadicshippedDodger Blue completes a triad with #ef3942 — three hues spaced evenly round the wheel, the classic way to get energy into a palette without a clash.
Steel Blue #4682b4
split-complementshippedSteel Blue is a split-complement of #ef3942: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Cadet Blue #5f9ea0
complementaryshippedCadet Blue sits directly opposite #ef3942 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 #ef3942 in 7 real palettes, including Google's brand system and Wired's brand system, as the accent.
Blue #0000ff
shipped9 real palettes, including native Cybersecurity's brand system and Doordash's brand system put Blue beside #ef3942, as the accent.
Cobalt Blue #0047ab
shippedDesigners have shipped Cobalt Blue with #ef3942: 7 real palettes, including NASA's brand system and Pepsi's brand system, as the lead colour.
Denim #1560bd
shippedDesigners have shipped Denim with #ef3942: 19 real palettes, including ElevenLabs's brand system and Costco's brand system, as the accent.
Real palettes that use #ef3942
Tints & shades
Harmonies
Contrast
| #ef3942 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.94:1 | fail | pass | fail | |
Aaon black | 5.33:1 | 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 #ef3942 as the background.
Brands using this color
Palettes built around it
Diner
Open in tool →Cherry red, mint-teal and butter yellow — chrome-and-vinyl retro; the red does the work, the teal cools it.
Frost & Ember
Open in tool →Navy and frost with one ember red — the classic cold-with-a-warm-accent structure, borrowed from a thousand ski posters.
Tequila Sunrise
Open in tool →Red through orange to yellow — the poured-drink gradient as flat tokens; use it left-to-right, never all at once.
Fonts for this mood
#ef3942 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:
mcpConnect your agent — build around #ef3942
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 #ef3942 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
tool url
/palettes/new/ef3942-c49f9c-62cb93-2d251f-f1e9ed?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