#E43537
Closest named color: Imperial Red (#E63946). oklch(60.4% 0.211 25.8), rgb(228, 53, 55).
Aa
Black text reads best on this color (4.86:1).
About this color
#E43537 is a medium-dark, vivid red. In OKLCH its lightness is 60%, its chroma 0.211 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Imperial Red (#E63946), ΔE 0.016 away. Black text reads best on it, at 4.86:1.
| Hue family | Reds |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.211) |
| Temperature | warm |
| Nearest name | Imperial Red (#E63946) |
| Black text | 4.86:1 |
| White text | 4.31:1 |
Values
| HEX | #E43537 |
| RGB | rgb(228, 53, 55) |
| HSL | hsl(359, 76%, 55%) |
| OKLCH | oklch(60.4% 0.211 25.8) |
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 #E43537 | 4.31:1 | AA large text | Lc -73.8 | Content text, not long reading |
| Black text on #E43537 | 4.86:1 | AA | Lc 35.8 | Non-text elements, placeholder text |
| #E43537 text on white | 4.31:1 | AA large text | Lc 68.3 | Content text, not long reading |
| #E43537 text on black | 4.86:1 | AA | Lc -33.4 | 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
#FDE3E0
oklch(93.6% 0.029 25.6)
-
Step 200
200
#FDCBC6
oklch(88.4% 0.057 24.9)
-
Step 300
300
#FCA79E
oklch(80.9% 0.102 26.2)
-
Step 400
400
#F67169
oklch(70.6% 0.165 25.6)
-
Step 500
500 (this color)
#E43537
oklch(60.4% 0.211 25.8)
-
Step 600
600
#D8001F
oklch(55.5% 0.226 25.8)
-
Step 700
700
#B70018
oklch(49.1% 0.199 25.9)
-
Step 800
800
#980012
oklch(42.8% 0.174 25.9)
-
Step 900
900
#7A1316
oklch(37.6% 0.137 25.7)
-
Step 950
950
#480F0E
oklch(27% 0.086 25.9)
#E43537 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) | #6B6135 | 0.229 |
| Deuteranopia (no green cones) | #968730 | 0.209 |
| Tritanopia (no blue cones) | #FB0038 | 0.047 |
| Achromatopsia (no color) | #7A7A7A | 0.212 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #E43537
#E43537
oklch(60.4% 0.211 25.8)
- #00929F
#00929F
oklch(60.3% 0.103 205.9)
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 #E43537, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Imperial Red #E63946 ΔE 0.016
- Red Pantone #EF233C ΔE 0.025
- Tomato Red #EC2D01 ΔE 0.031
- Vermillion #F4320C ΔE 0.039
- Faded Red #D3494E ΔE 0.040
- Cherry Red #F7022A ΔE 0.040
- Crimson #DC143C ΔE 0.040
- Pale Red #D9544D ΔE 0.045
Use #E43537 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.