#B03540
Closest named color: Dull Red (#BB3F3F). oklch(51.5% 0.159 19.8), rgb(176, 53, 64).
Aa
White text reads best on this color (6.12:1).
About this color
#B03540 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.159 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.032 away. White text reads best on it, at 6.12:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.159) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.42:1 |
| White text | 6.12:1 |
Values
| HEX | #B03540 |
| RGB | rgb(176, 53, 64) |
| HSL | hsl(355, 54%, 45%) |
| OKLCH | oklch(51.5% 0.159 19.8) |
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 #B03540 | 6.12:1 | AA | Lc -84.7 | Fine for body text |
| Black text on #B03540 | 3.42:1 | AA large text | Lc 24.6 | Dividers and decoration only |
| #B03540 text on white | 6.12:1 | AA | Lc 79.5 | Fine for body text |
| #B03540 text on black | 3.42:1 | AA large text | Lc -22.3 | 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
#EEADAC
oklch(80.8% 0.077 19.9)
-
Step 400
400
#E37F81
oklch(70.7% 0.124 19.4)
-
Step 500
500
#D85B61
oklch(63.1% 0.157 19.9)
-
Step 600
600
#C33C48
oklch(55.6% 0.171 19.8)
-
Step 700
700 (this color)
#B03540
oklch(51.5% 0.159 19.8)
-
Step 800
800
#882730
oklch(42.6% 0.131 19.6)
-
Step 900
900
#6E262A
oklch(37.8% 0.102 20.2)
-
Step 950
950
#411719
oklch(27% 0.066 19.7)
#B03540 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) | #565140 | 0.173 |
| Deuteranopia (no green cones) | #756B3D | 0.158 |
| Tritanopia (no blue cones) | #C1133A | 0.042 |
| Achromatopsia (no color) | #626262 | 0.160 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03540
#B03540
oklch(51.5% 0.159 19.8)
- #00767B
#00767B
oklch(51.4% 0.087 200)
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 #B03540, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.032
- Firebrick #B22222 ΔE 0.035
- Brown #A52A2A ΔE 0.038
- Light Burgundy #A8415B ΔE 0.039
- Dusty Red #B9484E ΔE 0.042
- Light Maroon #A24857 ΔE 0.044
- Rusty Red #AF2F0D ΔE 0.045
- Rouge #AB1239 ΔE 0.046
Use #B03540 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.