#E42A37
Closest named color: Imperial Red (#E63946). oklch(59.6% 0.218 24.1), rgb(228, 42, 55).
Aa
Black text reads best on this color (4.68:1).
About this color
#E42A37 is a medium-dark, vivid red. In OKLCH its lightness is 60%, its chroma 0.218 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Imperial Red (#E63946), ΔE 0.021 away. Black text reads best on it, at 4.68:1.
| Hue family | Reds |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.218) |
| Temperature | warm |
| Nearest name | Imperial Red (#E63946) |
| Black text | 4.68:1 |
| White text | 4.48:1 |
Values
| HEX | #E42A37 |
| RGB | rgb(228, 42, 55) |
| HSL | hsl(356, 78%, 53%) |
| OKLCH | oklch(59.6% 0.218 24.1) |
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 #E42A37 | 4.48:1 | AA large text | Lc -74.7 | Content text, not long reading |
| Black text on #E42A37 | 4.68:1 | AA | Lc 34.8 | Non-text elements, placeholder text |
| #E42A37 text on white | 4.48:1 | AA large text | Lc 69.2 | Content text, not long reading |
| #E42A37 text on black | 4.68:1 | AA | Lc -32.4 | 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
#FFF2F1
oklch(97.1% 0.014 22.8)
-
Step 100
100
#FEE2E0
oklch(93.5% 0.031 22.6)
-
Step 200
200
#FECBC6
oklch(88.5% 0.059 24.8)
-
Step 300
300
#FEA59F
oklch(80.9% 0.107 23.9)
-
Step 400
400
#F96E6A
oklch(70.7% 0.171 24.1)
-
Step 500
500 (this color)
#E42A37
oklch(59.6% 0.218 24.1)
-
Step 600
600
#D80027
oklch(55.6% 0.225 24.2)
-
Step 700
700
#B70020
oklch(49.1% 0.199 24)
-
Step 800
800
#970018
oklch(42.6% 0.173 24.2)
-
Step 900
900
#7C0D17
oklch(37.7% 0.143 24.1)
-
Step 950
950
#490D0F
oklch(27% 0.09 24)
#E42A37 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) | #675E35 | 0.239 |
| Deuteranopia (no green cones) | #94852F | 0.218 |
| Tritanopia (no blue cones) | #FB0031 | 0.043 |
| Achromatopsia (no color) | #777777 | 0.220 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #E42A37
#E42A37
oklch(59.6% 0.218 24.1)
- #00909B
#00909B
oklch(59.6% 0.102 204.3)
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 #E42A37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Imperial Red #E63946 ΔE 0.021
- Red Pantone #EF233C ΔE 0.022
- Crimson #DC143C ΔE 0.029
- Tomato Red #EC2D01 ΔE 0.036
- Cherry Red #F7022A ΔE 0.037
- Faded Red #D3494E ΔE 0.045
- Vermillion #F4320C ΔE 0.046
- Pink Red #F5054F ΔE 0.047
Use #E42A37 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.