#EF421F
Closest named color: Vermillion (#F4320C). oklch(63.1% 0.214 33), rgb(239, 66, 31).
Aa
Black text reads best on this color (5.46:1).
About this color
#EF421F is a medium-light, vivid red. In OKLCH its lightness is 63%, its chroma 0.214 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Vermillion (#F4320C), ΔE 0.018 away. Black text reads best on it, at 5.46:1.
| Hue family | Reds |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.214) |
| Temperature | warm |
| Nearest name | Vermillion (#F4320C) |
| Black text | 5.46:1 |
| White text | 3.83:1 |
Values
| HEX | #EF421F |
| RGB | rgb(239, 66, 31) |
| HSL | hsl(10, 87%, 53%) |
| OKLCH | oklch(63.1% 0.214 33) |
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 #EF421F | 3.83:1 | AA large text | Lc -69.9 | Content text, not long reading |
| Black text on #EF421F | 5.46:1 | AA | Lc 39.7 | Non-text elements, placeholder text |
| #EF421F text on white | 3.83:1 | AA large text | Lc 64.4 | Content text, not long reading |
| #EF421F text on black | 5.46:1 | 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
#FFF2EF
oklch(97.1% 0.015 33.1)
-
Step 100
100
#FDE3DD
oklch(93.5% 0.03 33.1)
-
Step 200
200
#FDCCC1
oklch(88.5% 0.058 32.8)
-
Step 300
300
#FDA895
oklch(81% 0.105 33.2)
-
Step 400
400
#F77358
oklch(70.8% 0.168 33.1)
-
Step 500
500 (this color)
#EF421F
oklch(63.1% 0.214 33)
-
Step 600
600
#D02A00
oklch(55.6% 0.205 33)
-
Step 700
700
#B02200
oklch(49.1% 0.181 33)
-
Step 800
800
#921A00
oklch(42.8% 0.158 32.9)
-
Step 900
900
#7B1500
oklch(37.8% 0.139 33.1)
-
Step 950
950
#480F05
oklch(26.9% 0.088 32.9)
#EF421F 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) | #776A17 | 0.226 |
| Deuteranopia (no green cones) | #A29011 | 0.204 |
| Tritanopia (no blue cones) | #FF003C | 0.061 |
| Achromatopsia (no color) | #828282 | 0.216 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #EF421F
#EF421F
oklch(63.1% 0.214 33)
- #009AB1
#009AB1
oklch(63% 0.11 213.1)
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 #EF421F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vermillion #F4320C ΔE 0.018
- Orangey Red #FA4224 ΔE 0.022
- Red Orange #FD3C06 ΔE 0.026
- Tomato Red #EC2D01 ΔE 0.027
- Orangered #FE420F ΔE 0.029
- Orange Red #FF4500 ΔE 0.034
- Blood Orange #FE4B03 ΔE 0.036
- Deep Orange #DC4D01 ΔE 0.041
Use #EF421F 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.