#E31B03
Closest named color: Tomato Red (#EC2D01). oklch(58.3% 0.229 30.5), rgb(227, 27, 3).
Aa
White text reads best on this color (4.74:1).
About this color
#E31B03 is a medium-dark, vivid red. In OKLCH its lightness is 58%, its chroma 0.229 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Tomato Red (#EC2D01), ΔE 0.027 away. White text reads best on it, at 4.74:1.
| Hue family | Reds |
| Lightness | medium-dark (58%) |
| Chroma | vivid (0.229) |
| Temperature | warm |
| Nearest name | Tomato Red (#EC2D01) |
| Black text | 4.42:1 |
| White text | 4.74:1 |
Values
| HEX | #E31B03 |
| RGB | rgb(227, 27, 3) |
| HSL | hsl(6, 97%, 45%) |
| OKLCH | oklch(58.3% 0.229 30.5) |
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 #E31B03 | 4.74:1 | AA | Lc -76.1 | Fine for body text |
| Black text on #E31B03 | 4.42:1 | AA large text | Lc 33.5 | Non-text elements, placeholder text |
| #E31B03 text on white | 4.74:1 | AA | Lc 70.6 | Content text, not long reading |
| #E31B03 text on black | 4.42:1 | AA large text | Lc -31.1 | 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
#FFF2F0
oklch(97.1% 0.014 28)
-
Step 100
100
#FDE3DE
oklch(93.6% 0.03 30.6)
-
Step 200
200
#FDCCC3
oklch(88.5% 0.057 30.3)
-
Step 300
300
#FCA799
oklch(80.8% 0.103 29.8)
-
Step 400
400
#F6735F
oklch(70.7% 0.165 30.5)
-
Step 500
500
#EE432E
oklch(63.2% 0.211 30.6)
-
Step 600
600 (this color)
#E31B03
oklch(58.3% 0.229 30.5)
-
Step 700
700
#B51100
oklch(49.1% 0.194 30.5)
-
Step 800
800
#960C00
oklch(42.7% 0.169 30.4)
-
Step 900
900
#7A150A
oklch(37.7% 0.137 30.4)
-
Step 950
950
#480F09
oklch(26.9% 0.087 29.9)
#E31B03 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) | #645800 | 0.249 |
| Deuteranopia (no green cones) | #938200 | 0.220 |
| Tritanopia (no blue cones) | #FB001C | 0.048 |
| Achromatopsia (no color) | #737373 | 0.231 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #E31B03
#E31B03
oklch(58.3% 0.229 30.5)
- #008B9C
#008B9C
oklch(58.3% 0.101 209.8)
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 #E31B03, closest first.
No curated palette has a color within ΔE 0.04 of #E31B03.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Tomato Red #EC2D01 ΔE 0.027
- Crimson #DC143C ΔE 0.043
- Red Pantone #EF233C ΔE 0.043
- Vermillion #F4320C ΔE 0.045
- Cherry Red #F7022A ΔE 0.045
- Imperial Red #E63946 ΔE 0.048
- Fire Engine Red #FE0002 ΔE 0.052
- Red #FF0000 ΔE 0.054
Use #E31B03 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.