#EF403B
Closest named color: Imperial Red (#E63946). oklch(63.2% 0.212 27), rgb(239, 64, 59).
Aa
Black text reads best on this color (5.46:1).
About this color
#EF403B is a medium-light, vivid red. In OKLCH its lightness is 63%, its chroma 0.212 and its hue 27°. Its hue sits on the warm side of the wheel. The nearest named color is Imperial Red (#E63946), ΔE 0.027 away. Black text reads best on it, at 5.46:1.
| Hue family | Reds |
| Lightness | medium-light (63%) |
| Chroma | vivid (0.212) |
| Temperature | warm |
| Nearest name | Imperial Red (#E63946) |
| Black text | 5.46:1 |
| White text | 3.84:1 |
Values
| HEX | #EF403B |
| RGB | rgb(239, 64, 59) |
| HSL | hsl(2, 85%, 58%) |
| OKLCH | oklch(63.2% 0.212 27) |
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 #EF403B | 3.84:1 | AA large text | Lc -69.9 | Content text, not long reading |
| Black text on #EF403B | 5.46:1 | AA | Lc 39.6 | Non-text elements, placeholder text |
| #EF403B text on white | 3.84:1 | AA large text | Lc 64.5 | Content text, not long reading |
| #EF403B text on black | 5.46:1 | AA | Lc -37.2 | 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
#FDCBC5
oklch(88.4% 0.058 26.2)
-
Step 300
300
#FDA79C
oklch(81% 0.104 27.6)
-
Step 400
400
#F77166
oklch(70.7% 0.167 26.9)
-
Step 500
500 (this color)
#EF403B
oklch(63.2% 0.212 27)
-
Step 600
600
#D90017
oklch(55.7% 0.227 27)
-
Step 700
700
#B70012
oklch(49% 0.2 27)
-
Step 800
800
#98000D
oklch(42.8% 0.174 27)
-
Step 900
900
#7B1213
oklch(37.7% 0.139 26.7)
-
Step 950
950
#480F0C
oklch(27% 0.087 27.6)
#EF403B 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) | #756A38 | 0.228 |
| Deuteranopia (no green cones) | #A09034 | 0.209 |
| Tritanopia (no blue cones) | #FF0041 | 0.049 |
| Achromatopsia (no color) | #828282 | 0.214 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #EF403B
#EF403B
oklch(63.2% 0.212 27)
- #009CAB
#009CAB
oklch(63.3% 0.108 206.8)
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 #EF403B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Imperial Red #E63946 ΔE 0.027
- Vermillion #F4320C ΔE 0.028
- Orangey Red #FA4224 ΔE 0.029
- Red Pantone #EF233C ΔE 0.032
- Strawberry #FB2943 ΔE 0.032
- Tomato Red #EC2D01 ΔE 0.035
- Pinky Red #FC2647 ΔE 0.037
- Light Red #FF474C ΔE 0.038
Use #EF403B 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.