#EF5437
Closest named color: Orangey Red (#FA4224). oklch(65.2% 0.196 32.7), rgb(239, 84, 55).
Aa
Black text reads best on this color (5.99:1).
About this color
#EF5437 is a medium-light, vivid red. In OKLCH its lightness is 65%, its chroma 0.196 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Orangey Red (#FA4224), ΔE 0.028 away. Black text reads best on it, at 5.99:1.
| Hue family | Reds |
| Lightness | medium-light (65%) |
| Chroma | vivid (0.196) |
| Temperature | warm |
| Nearest name | Orangey Red (#FA4224) |
| Black text | 5.99:1 |
| White text | 3.50:1 |
Values
| HEX | #EF5437 |
| RGB | rgb(239, 84, 55) |
| HSL | hsl(9, 85%, 58%) |
| OKLCH | oklch(65.2% 0.196 32.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #EF5437 | 3.50:1 | AA large text | Lc -67.0 | Content text, not long reading |
| Black text on #EF5437 | 5.99:1 | AA | Lc 42.5 | Non-text elements, placeholder text |
| #EF5437 text on white | 3.50:1 | AA large text | Lc 61.5 | Content text, not long reading |
| #EF5437 text on black | 5.99:1 | AA | Lc -40.2 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 500.
-
Step 50
50
#FEF3F0
oklch(97.2% 0.013 35.7)
-
Step 100
100
#FCE4DE
oklch(93.7% 0.028 34.3)
-
Step 200
200
#FACDC3
oklch(88.5% 0.053 32.7)
-
Step 300
300
#F8AA99
oklch(80.9% 0.096 32.8)
-
Step 400
400
#F07860
oklch(70.6% 0.153 32.7)
-
Step 500
500 (this color)
#EF5437
oklch(65.2% 0.196 32.7)
-
Step 600
600
#D12900
oklch(55.7% 0.207 32.8)
-
Step 700
700
#B12100
oklch(49.2% 0.183 32.8)
-
Step 800
800
#921900
oklch(42.7% 0.159 32.7)
-
Step 900
900
#771C0B
oklch(37.8% 0.128 32.6)
-
Step 950
950
#461309
oklch(27.1% 0.081 33.1)
#EF5437 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #807333 | 0.203 |
| Deuteranopia (no green cones) | #A79631 | 0.186 |
| Tritanopia (no blue cones) | #FF274E | 0.069 |
| Achromatopsia (no color) | #898989 | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #EF5437
#EF5437
oklch(65.2% 0.196 32.7)
- #00A1B9
#00A1B9
oklch(65.1% 0.114 213.1)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #EF5437, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Orangey Red #FA4224 ΔE 0.028
- Blood Orange #FE4B03 ΔE 0.034
- Orange Pant #FB5607 ΔE 0.034
- Orangered #FE420F ΔE 0.034
- Orange Red #FF4500 ΔE 0.036
- Red Orange #FD3C06 ΔE 0.038
- Grapefruit #FD5956 ΔE 0.042
- Light Red #FF474C ΔE 0.042
Use #EF5437 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.