#BB4037
Closest named color: Dull Red (#BB3F3F). oklch(54.4% 0.16 27.8), rgb(187, 64, 55).
Aa
White text reads best on this color (5.38:1).
About this color
#BB4037 is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.160 and its hue 28°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.010 away. White text reads best on it, at 5.38:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.160) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.90:1 |
| White text | 5.38:1 |
Values
| HEX | #BB4037 |
| RGB | rgb(187, 64, 55) |
| HSL | hsl(4, 55%, 47%) |
| OKLCH | oklch(54.4% 0.16 27.8) |
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 #BB4037 | 5.38:1 | AA | Lc -81.2 | Fine for body text |
| Black text on #BB4037 | 3.90:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #BB4037 text on white | 5.38:1 | AA | Lc 75.9 | Fine for body text |
| #BB4037 text on black | 3.90:1 | AA large text | Lc -25.9 | 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
#F8E5E2
oklch(93.6% 0.021 28.3)
-
Step 200
200
#F3D0CB
oklch(88.6% 0.04 27.5)
-
Step 300
300
#ECAFA7
oklch(80.8% 0.073 27.2)
-
Step 400
400
#DF8378
oklch(70.6% 0.115 27.6)
-
Step 500
500
#D46155
oklch(63.1% 0.148 28)
-
Step 600
600 (this color)
#BB4037
oklch(54.4% 0.16 27.8)
-
Step 700
700
#A4342D
oklch(49% 0.149 27.5)
-
Step 800
800
#862D26
oklch(42.8% 0.123 27.9)
-
Step 900
900
#6C2923
oklch(37.7% 0.097 27.7)
-
Step 950
950
#3F1915
oklch(26.9% 0.06 27.9)
#BB4037 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) | #625935 | 0.169 |
| Deuteranopia (no green cones) | #817433 | 0.155 |
| Tritanopia (no blue cones) | #CD203F | 0.052 |
| Achromatopsia (no color) | #6A6A6A | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #BB4037
#BB4037
oklch(54.4% 0.16 27.8)
- #007F8C
#007F8C
oklch(54.5% 0.094 207.3)
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 #BB4037, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.010
- Dusty Red #B9484E ΔE 0.027
- Sinopia #BB3E03 ΔE 0.035
- Brick Orange #C14A09 ΔE 0.045
- Dark Rose #B5485D ΔE 0.048
- Rusty Red #AF2F0D ΔE 0.048
- Firebrick #B22222 ΔE 0.051
- Burnt Orange #C04E01 ΔE 0.052
Use #BB4037 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.