#EF3C00
Closest named color: Vermillion (#F4320C). oklch(62.5% 0.221 34.6), rgb(239, 60, 0).
Aa
Black text reads best on this color (5.31:1).
About this color
#EF3C00 is a medium-light, vivid red. In OKLCH its lightness is 63%, its chroma 0.221 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Vermillion (#F4320C), ΔE 0.014 away. Black text reads best on it, at 5.31:1.
| Hue family | Reds |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.221) |
| Temperature | warm |
| Nearest name | Vermillion (#F4320C) |
| Black text | 5.31:1 |
| White text | 3.94:1 |
Values
| HEX | #EF3C00 |
| RGB | rgb(239, 60, 0) |
| HSL | hsl(15, 100%, 47%) |
| OKLCH | oklch(62.5% 0.221 34.6) |
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 #EF3C00 | 3.94:1 | AA large text | Lc -70.7 | Content text, not long reading |
| Black text on #EF3C00 | 5.31:1 | AA | Lc 38.9 | Non-text elements, placeholder text |
| #EF3C00 text on white | 3.94:1 | AA large text | Lc 65.2 | Content text, not long reading |
| #EF3C00 text on black | 5.31:1 | AA | Lc -36.5 | 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
#FEE3DC
oklch(93.6% 0.031 34.9)
-
Step 200
200
#FECCBF
oklch(88.5% 0.06 35)
-
Step 300
300
#FEA791
oklch(80.9% 0.108 34.9)
-
Step 400
400
#F97151
oklch(70.7% 0.174 34.6)
-
Step 500
500 (this color)
#EF3C00
oklch(62.5% 0.221 34.6)
-
Step 600
600
#CD3200
oklch(55.7% 0.197 34.6)
-
Step 700
700
#AD2900
oklch(49.1% 0.173 34.7)
-
Step 800
800
#8F2000
oklch(42.7% 0.151 34.7)
-
Step 900
900
#781900
oklch(37.6% 0.133 34.6)
-
Step 950
950
#490E02
oklch(26.9% 0.091 34.5)
#EF3C00 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) | #756700 | 0.231 |
| Deuteranopia (no green cones) | #A18E00 | 0.206 |
| Tritanopia (no blue cones) | #FF0035 | 0.058 |
| Achromatopsia (no color) | #808080 | 0.223 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #EF3C00
#EF3C00
oklch(62.5% 0.221 34.6)
- #0098B1
#0098B1
oklch(62.5% 0.11 214.8)
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 #EF3C00, closest first.
No curated palette has a color within ΔE 0.04 of #EF3C00.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vermillion #F4320C ΔE 0.014
- Tomato Red #EC2D01 ΔE 0.020
- Red Orange #FD3C06 ΔE 0.028
- Orangey Red #FA4224 ΔE 0.028
- Orangered #FE420F ΔE 0.032
- Orange Red #FF4500 ΔE 0.036
- Deep Orange #DC4D01 ΔE 0.039
- Blood Orange #FE4B03 ΔE 0.040
Use #EF3C00 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.