#B03440
Closest named color: Dull Red (#BB3F3F). oklch(51.4% 0.16 19.5), rgb(176, 52, 64).
Aa
White text reads best on this color (6.15:1).
About this color
#B03440 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.160 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.033 away. White text reads best on it, at 6.15:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.160) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.41:1 |
| White text | 6.15:1 |
Values
| HEX | #B03440 |
| RGB | rgb(176, 52, 64) |
| HSL | hsl(354, 54%, 45%) |
| OKLCH | oklch(51.4% 0.16 19.5) |
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 #B03440 | 6.15:1 | AA | Lc -84.8 | Fine for body text |
| Black text on #B03440 | 3.41:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #B03440 text on white | 6.15:1 | AA | Lc 79.6 | Fine for body text |
| #B03440 text on black | 3.41:1 | AA large text | Lc -22.2 | 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
#FCF3F3
oklch(97.1% 0.01 17.3)
-
Step 100
100
#F9E4E4
oklch(93.6% 0.023 17.6)
-
Step 200
200
#F4CFCE
oklch(88.6% 0.042 19.8)
-
Step 300
300
#EFADAC
oklch(80.9% 0.078 19.9)
-
Step 400
400
#E37F81
oklch(70.7% 0.124 19.4)
-
Step 500
500
#D85B62
oklch(63.2% 0.157 19.4)
-
Step 600
600
#C33C48
oklch(55.6% 0.171 19.8)
-
Step 700
700 (this color)
#B03440
oklch(51.4% 0.16 19.5)
-
Step 800
800
#892730
oklch(42.8% 0.132 19.7)
-
Step 900
900
#6E252A
oklch(37.6% 0.104 19.6)
-
Step 950
950
#411719
oklch(27% 0.066 19.7)
#B03440 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) | #555140 | 0.175 |
| Deuteranopia (no green cones) | #756B3D | 0.160 |
| Tritanopia (no blue cones) | #C11139 | 0.042 |
| Achromatopsia (no color) | #616161 | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03440
#B03440
oklch(51.4% 0.16 19.5)
- #00767A
#00767A
oklch(51.4% 0.087 198.9)
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 #B03440, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.033
- Firebrick #B22222 ΔE 0.034
- Brown #A52A2A ΔE 0.037
- Light Burgundy #A8415B ΔE 0.039
- Dusty Red #B9484E ΔE 0.043
- Rouge #AB1239 ΔE 0.044
- Light Maroon #A24857 ΔE 0.045
- Lipstick Red #C0022F ΔE 0.045
Use #B03440 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.