#EF4137
Closest named color: Vermillion (#F4320C). oklch(63.3% 0.212 28.2), rgb(239, 65, 55).
Aa
Black text reads best on this color (5.48:1).
About this color
#EF4137 is a medium-light, vivid red. In OKLCH its lightness is 63%, its chroma 0.212 and its hue 28°. Its hue sits on the warm side of the wheel. The nearest named color is Vermillion (#F4320C), ΔE 0.025 away. Black text reads best on it, at 5.48:1.
| Hue family | Reds |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.212) |
| Temperature | warm |
| Nearest name | Vermillion (#F4320C) |
| Black text | 5.48:1 |
| White text | 3.83:1 |
Values
| HEX | #EF4137 |
| RGB | rgb(239, 65, 55) |
| HSL | hsl(3, 85%, 58%) |
| OKLCH | oklch(63.3% 0.212 28.2) |
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 #EF4137 | 3.83:1 | AA large text | Lc -69.9 | Content text, not long reading |
| Black text on #EF4137 | 5.48:1 | AA | Lc 39.7 | Non-text elements, placeholder text |
| #EF4137 text on white | 3.83:1 | AA large text | Lc 64.4 | Content text, not long reading |
| #EF4137 text on black | 5.48:1 | AA | Lc -37.3 | 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
#FFF2F0
oklch(97.1% 0.014 28)
-
Step 100
100
#FEE3DF
oklch(93.7% 0.03 27.8)
-
Step 200
200
#FDCCC4
oklch(88.6% 0.057 29)
-
Step 300
300
#FDA79B
oklch(81% 0.104 28.3)
-
Step 400
400
#F77263
oklch(70.8% 0.166 28.5)
-
Step 500
500 (this color)
#EF4137
oklch(63.3% 0.212 28.2)
-
Step 600
600
#D9000D
oklch(55.6% 0.228 28.2)
-
Step 700
700
#B80009
oklch(49.2% 0.201 28.2)
-
Step 800
800
#980006
oklch(42.7% 0.175 28.2)
-
Step 900
900
#7B1310
oklch(37.8% 0.139 28.1)
-
Step 950
950
#480F0B
oklch(27% 0.087 28.4)
#EF4137 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) | #756A34 | 0.228 |
| Deuteranopia (no green cones) | #A09030 | 0.207 |
| Tritanopia (no blue cones) | #FF0041 | 0.052 |
| Achromatopsia (no color) | #828282 | 0.214 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #EF4137
#EF4137
oklch(63.3% 0.212 28.2)
- #009CAC
#009CAC
oklch(63.3% 0.109 207.6)
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 #EF4137, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vermillion #F4320C ΔE 0.025
- Orangey Red #FA4224 ΔE 0.026
- Imperial Red #E63946 ΔE 0.030
- Tomato Red #EC2D01 ΔE 0.033
- Red Orange #FD3C06 ΔE 0.035
- Red Pantone #EF233C ΔE 0.035
- Strawberry #FB2943 ΔE 0.036
- Orangered #FE420F ΔE 0.037
Use #EF4137 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.