#E31728
Closest named color: Crimson (#DC143C). oklch(58.3% 0.228 25.6), rgb(227, 23, 40).
Aa
White text reads best on this color (4.75:1).
About this color
#E31728 is a medium-dark, vivid red. In OKLCH its lightness is 58%, its chroma 0.228 and its hue 26°. Its hue sits on the warm side of the wheel. The nearest named color is Crimson (#DC143C), ΔE 0.025 away. White text reads best on it, at 4.75:1.
| Hue family | Reds |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.228) |
| Temperature | warm |
| Nearest name | Crimson (#DC143C) |
| Black text | 4.41:1 |
| White text | 4.75:1 |
Values
| HEX | #E31728 |
| RGB | rgb(227, 23, 40) |
| HSL | hsl(355, 82%, 49%) |
| OKLCH | oklch(58.3% 0.228 25.6) |
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 #E31728 | 4.75:1 | AA | Lc -76.1 | Fine for body text |
| Black text on #E31728 | 4.41:1 | AA large text | Lc 33.5 | Non-text elements, placeholder text |
| #E31728 text on white | 4.75:1 | AA | Lc 70.6 | Content text, not long reading |
| #E31728 text on black | 4.41:1 | AA large text | Lc -31.0 | 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 600.
-
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
#F6726A
oklch(70.8% 0.164 25.6)
-
Step 500
500
#EE4141
oklch(63.2% 0.21 25.5)
-
Step 600
600 (this color)
#E31728
oklch(58.3% 0.228 25.6)
-
Step 700
700
#B70019
oklch(49.1% 0.199 25.7)
-
Step 800
800
#980013
oklch(42.8% 0.174 25.6)
-
Step 900
900
#7A1316
oklch(37.6% 0.137 25.7)
-
Step 950
950
#480F0E
oklch(27% 0.086 25.9)
#E31728 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) | #625825 | 0.251 |
| Deuteranopia (no green cones) | #91821C | 0.228 |
| Tritanopia (no blue cones) | #FA0022 | 0.044 |
| Achromatopsia (no color) | #737373 | 0.230 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #E31728
#E31728
oklch(58.3% 0.228 25.6)
- #008C98
#008C98
oklch(58.4% 0.1 205.4)
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 #E31728, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Crimson #DC143C ΔE 0.025
- Red Pantone #EF233C ΔE 0.032
- Tomato Red #EC2D01 ΔE 0.037
- Imperial Red #E63946 ΔE 0.038
- Cherry Red #F7022A ΔE 0.039
- Cherry #CF0234 ΔE 0.048
- Vermillion #F4320C ΔE 0.051
- Lipstick #D5174E ΔE 0.052
Use #E31728 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.