#EF4C03
Closest named color: Blood Orange (#FE4B03). oklch(64% 0.209 37.8), rgb(239, 76, 3).
Aa
Black text reads best on this color (5.70:1).
About this color
#EF4C03 is a medium-light, vivid red. In OKLCH its lightness is 64%, its chroma 0.209 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Blood Orange (#FE4B03), ΔE 0.028 away. Black text reads best on it, at 5.70:1.
| Hue family | Reds |
| Lightness | medium-light (64%) |
| Chroma | vivid (0.209) |
| Temperature | warm |
| Nearest name | Blood Orange (#FE4B03) |
| Black text | 5.70:1 |
| White text | 3.68:1 |
Values
| HEX | #EF4C03 |
| RGB | rgb(239, 76, 3) |
| HSL | hsl(19, 98%, 47%) |
| OKLCH | oklch(64% 0.209 37.8) |
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 #EF4C03 | 3.68:1 | AA large text | Lc -68.5 | Content text, not long reading |
| Black text on #EF4C03 | 5.70:1 | AA | Lc 41.0 | Non-text elements, placeholder text |
| #EF4C03 text on white | 3.68:1 | AA large text | Lc 63.1 | Content text, not long reading |
| #EF4C03 text on black | 5.70:1 | AA | Lc -38.6 | 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
#FEF3EF
oklch(97.2% 0.013 41.2)
-
Step 100
100
#FDE4DC
oklch(93.7% 0.03 38.6)
-
Step 200
200
#FCCDBF
oklch(88.5% 0.057 37.2)
-
Step 300
300
#FAA991
oklch(80.8% 0.102 37.2)
-
Step 400
400
#F4764F
oklch(70.7% 0.164 37.8)
-
Step 500
500 (this color)
#EF4C03
oklch(64% 0.209 37.8)
-
Step 600
600
#C63D00
oklch(55.5% 0.182 37.9)
-
Step 700
700
#A83200
oklch(49.1% 0.162 37.8)
-
Step 800
800
#8B2800
oklch(42.8% 0.14 37.9)
-
Step 900
900
#752000
oklch(37.7% 0.124 37.7)
-
Step 950
950
#471101
oklch(26.9% 0.086 37.7)
#EF4C03 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) | #7E6E00 | 0.211 |
| Deuteranopia (no green cones) | #A69300 | 0.190 |
| Tritanopia (no blue cones) | #FF0042 | 0.083 |
| Achromatopsia (no color) | #858585 | 0.211 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #EF4C03
#EF4C03
oklch(64% 0.209 37.8)
- #009CBA
#009CBA
oklch(63.9% 0.115 217.9)
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 #EF4C03, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blood Orange #FE4B03 ΔE 0.028
- Orangey Red #FA4224 ΔE 0.029
- Orangered #FE420F ΔE 0.030
- Orange Red #FF4500 ΔE 0.030
- Red Orange #FD3C06 ΔE 0.030
- Orange Pant #FB5607 ΔE 0.031
- Vermillion #F4320C ΔE 0.034
- Deep Orange #DC4D01 ΔE 0.036
Use #EF4C03 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.