#B4403F
Closest named color: Dull Red (#BB3F3F). oklch(53.4% 0.151 24.2), rgb(180, 64, 63).
Aa
White text reads best on this color (5.60:1).
About this color
#B4403F is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.151 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.014 away. White text reads best on it, at 5.60:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.151) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.74:1 |
| White text | 5.60:1 |
Values
| HEX | #B4403F |
| RGB | rgb(180, 64, 63) |
| HSL | hsl(1, 48%, 48%) |
| OKLCH | oklch(53.4% 0.151 24.2) |
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 #B4403F | 5.60:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #B4403F | 3.74:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #B4403F text on white | 5.60:1 | AA | Lc 77.2 | Fine for body text |
| #B4403F text on black | 3.74:1 | AA large text | Lc -24.6 | 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 600.
-
Step 50
50
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F7E5E3
oklch(93.6% 0.02 25.2)
-
Step 200
200
#F1D0CD
oklch(88.5% 0.037 24)
-
Step 300
300
#EAB0AB
oklch(80.9% 0.069 24.3)
-
Step 400
400
#DC857F
oklch(70.7% 0.108 24.4)
-
Step 500
500
#D0635F
oklch(63% 0.139 24)
-
Step 600
600 (this color)
#B4403F
oklch(53.4% 0.151 24.2)
-
Step 700
700
#A13737
oklch(49% 0.141 23.9)
-
Step 800
800
#832F2E
oklch(42.7% 0.116 24)
-
Step 900
900
#6A2B29
oklch(37.8% 0.091 24.2)
-
Step 950
950
#3E1A18
oklch(27% 0.057 24.8)
#B4403F 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) | #5F583E | 0.161 |
| Deuteranopia (no green cones) | #7C713C | 0.149 |
| Tritanopia (no blue cones) | #C52641 | 0.045 |
| Achromatopsia (no color) | #686868 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B4403F
#B4403F
oklch(53.4% 0.151 24.2)
- #007C85
#007C85
oklch(53.4% 0.091 203.7)
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 #B4403F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.014
- Dusty Red #B9484E ΔE 0.024
- Dark Rose #B5485D ΔE 0.039
- Light Maroon #A24857 ΔE 0.045
- Light Burgundy #A8415B ΔE 0.046
- Sinopia #BB3E03 ΔE 0.046
- Rusty Red #AF2F0D ΔE 0.047
- Firebrick #B22222 ΔE 0.047
Use #B4403F 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.