Color
#ef3a34
#ef3a34rgb(239, 58, 52)hsl(2, 85%, 57%)oklch(0.626 0.218 27.6)Colors that go with #ef3a34
Cadet Blue, Amber and Charcoal 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.
Cadet Blue #5f9ea0
complementaryshippedCadet Blue sits directly opposite #ef3a34 on the wheel — the strongest contrast one hue can give another, so use it small: a button, a link colour, one highlight.
Charcoal #36454f
neutralshippedCharcoal is the body-text near-black for #ef3a34: its slight blue cast keeps type crisp beside a warm colour where pure #000 looks heavy.
Gold #ffd700
shippedGold is paired with #ef3a34 in 5 real palettes, including Tequila Sunrise and Streetwear, as the accent — a combination designers have actually shipped, not a computed rotation.
Mustard Yellow #ffdb58
shippedMustard Yellow is paired with #ef3a34 in 4 real palettes, including Diner and Crayon Box, as the accent — a combination designers have actually shipped, not a computed rotation.
Slate Gray #708090
shippedSlate Gray is paired with #ef3a34 in 4 real palettes, including Gallery and Noir Beauty, as the supporting colour — a combination designers have actually shipped, not a computed rotation.
Taupe #483c32
shippedTaupe is paired with #ef3a34 in 10 real palettes, including Airbnb's brand system and Crayon Box, as the text colour against it — a combination designers have actually shipped, not a computed rotation.
Steel Blue #4682b4
split-complementshippedSteel Blue is a split-complement of #ef3a34: nearly opposite, so it still pops against it, without the vibrating edge of a true complement.
Real palettes that use #ef3a34
Tints & shades
Harmonies
Contrast
| #ef3a34 as text | Ratio | AA | AA large | AAA | Fix |
|---|---|---|---|---|---|
Aaon white | 3.94:1 | fail | pass | fail | |
Aaon black | 5.32:1 | 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 #ef3a34 as the background.
Brands using this color
No public brand in the corpus uses this exact color yet. Extract a brand to add one.
Fonts for this mood
#ef3a34 reads as warm, vivid, playful. The font library is tagged with the same vocabulary:
Point 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.
https://mcp.brandsweets.com/colors/mcpclaude mcp add --transport http brandsweets-colors https://mcp.brandsweets.com/colors/mcp
›analyze #ef3a34 and generate a 5-color palette that keeps it as the primary; give me the /palettes/new link
/palettes/new/ef3a34-c4a29c-62cb9c-2d261f-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