#EF4305
Closest named color: Vermillion (#F4320C). oklch(63.1% 0.216 35.7), rgb(239, 67, 5).
Aa
Black text reads best on this color (5.47:1).
About this color
#EF4305 is a medium-light, vivid red. In OKLCH its lightness is 63%, its chroma 0.216 and its hue 36°. Its hue sits on the warm side of the wheel. The nearest named color is Vermillion (#F4320C), ΔE 0.021 away. Black text reads best on it, at 5.47:1.
| Hue family | Reds |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.216) |
| Temperature | warm |
| Nearest name | Vermillion (#F4320C) |
| Black text | 5.47:1 |
| White text | 3.83:1 |
Values
| HEX | #EF4305 |
| RGB | rgb(239, 67, 5) |
| HSL | hsl(16, 96%, 48%) |
| OKLCH | oklch(63.1% 0.216 35.7) |
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 #EF4305 | 3.83:1 | AA large text | Lc -69.8 | Content text, not long reading |
| Black text on #EF4305 | 5.47:1 | AA | Lc 39.7 | Non-text elements, placeholder text |
| #EF4305 text on white | 3.83:1 | AA large text | Lc 64.3 | Content text, not long reading |
| #EF4305 text on black | 5.47:1 | 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
#FDE3DC
oklch(93.5% 0.03 35.5)
-
Step 200
200
#FDCCBF
oklch(88.4% 0.059 35.3)
-
Step 300
300
#FDA891
oklch(80.9% 0.106 35.8)
-
Step 400
400
#F77351
oklch(70.7% 0.17 35.5)
-
Step 500
500 (this color)
#EF4305
oklch(63.1% 0.216 35.7)
-
Step 600
600
#CA3600
oklch(55.5% 0.191 35.7)
-
Step 700
700
#AB2C00
oklch(49% 0.169 35.7)
-
Step 800
800
#8E2300
oklch(42.8% 0.148 35.7)
-
Step 900
900
#771C00
oklch(37.7% 0.13 35.8)
-
Step 950
950
#481002
oklch(27% 0.088 36)
#EF4305 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) | #796A00 | 0.223 |
| Deuteranopia (no green cones) | #A39000 | 0.200 |
| Tritanopia (no blue cones) | #FF003B | 0.068 |
| Achromatopsia (no color) | #828282 | 0.217 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #EF4305
#EF4305
oklch(63.1% 0.216 35.7)
- #009AB4
#009AB4
oklch(63.2% 0.112 215.3)
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 #EF4305, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vermillion #F4320C ΔE 0.021
- Orangey Red #FA4224 ΔE 0.025
- Red Orange #FD3C06 ΔE 0.026
- Tomato Red #EC2D01 ΔE 0.029
- Orangered #FE420F ΔE 0.029
- Orange Red #FF4500 ΔE 0.032
- Blood Orange #FE4B03 ΔE 0.034
- Deep Orange #DC4D01 ΔE 0.037
Use #EF4305 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.