#B40038
Closest named color: Rouge (#AB1239). oklch(48.9% 0.196 16), rgb(180, 0, 56).
Aa
White text reads best on this color (7.00:1).
About this color
#B40038 is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.196 and its hue 16°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.018 away. White text reads best on it, at 7.00:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.196) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.99:1 |
| White text | 7.00:1 |
Values
| HEX | #B40038 |
| RGB | rgb(180, 0, 56) |
| HSL | hsl(341, 100%, 35%) |
| OKLCH | oklch(48.9% 0.196 16) |
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 #B40038 | 7.00:1 | AAA | Lc -86.8 | Fine for body text |
| Black text on #B40038 | 2.99:1 | Fails | Lc 22.4 | Dividers and decoration only |
| #B40038 text on white | 7.00:1 | AAA | Lc 81.7 | Fine for body text |
| #B40038 text on black | 2.99:1 | Fails | Lc -20.2 | Dividers and decoration only |
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 700.
-
Step 50
50
#FEF2F2
oklch(97.1% 0.013 17.4)
-
Step 100
100
#FCE3E4
oklch(93.6% 0.028 14.9)
-
Step 200
200
#FACCCD
oklch(88.5% 0.052 16.7)
-
Step 300
300
#F8A8AC
oklch(81% 0.095 16.1)
-
Step 400
400
#EF7580
oklch(70.7% 0.15 16.1)
-
Step 500
500
#E64860
oklch(63.1% 0.194 16.1)
-
Step 600
600
#D11A47
oklch(55.5% 0.21 15.9)
-
Step 700
700 (this color)
#B40038
oklch(48.9% 0.196 16)
-
Step 800
800
#930F2F
oklch(42.8% 0.162 16.1)
-
Step 900
900
#76192A
oklch(37.7% 0.126 15.8)
-
Step 950
950
#461119
oklch(27.1% 0.081 15.7)
#B40038 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) | #464338 | 0.220 |
| Deuteranopia (no green cones) | #6F6533 | 0.199 |
| Tritanopia (no blue cones) | #C60020 | 0.047 |
| Achromatopsia (no color) | #595959 | 0.197 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B40038
#B40038
oklch(48.9% 0.196 16)
- #006E6F
#006E6F
oklch(48.8% 0.083 195.9)
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 #B40038, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.018
- Rose Red #BE013C ΔE 0.022
- Raspberry #B00149 ΔE 0.026
- Lipstick Red #C0022F ΔE 0.029
- Scarlet #BE0119 ΔE 0.039
- Firebrick #B22222 ΔE 0.040
- Brown #A52A2A ΔE 0.047
- Cranberry #9E003A ΔE 0.048
Use #B40038 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.