#B63137
Closest named color: Dull Red (#BB3F3F). oklch(52% 0.169 23.1), rgb(182, 49, 55).
Aa
White text reads best on this color (6.02:1).
About this color
#B63137 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.169 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.027 away. White text reads best on it, at 6.02:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.169) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.48:1 |
| White text | 6.02:1 |
Values
| HEX | #B63137 |
| RGB | rgb(182, 49, 55) |
| HSL | hsl(357, 58%, 45%) |
| OKLCH | oklch(52% 0.169 23.1) |
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 #B63137 | 6.02:1 | AA | Lc -84.1 | Fine for body text |
| Black text on #B63137 | 3.48:1 | AA large text | Lc 25.2 | Dividers and decoration only |
| #B63137 text on white | 6.02:1 | AA | Lc 78.9 | Fine for body text |
| #B63137 text on black | 3.48:1 | AA large text | Lc -22.9 | 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 700.
-
Step 50
50
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FAE4E2
oklch(93.6% 0.024 23.9)
-
Step 200
200
#F6CECB
oklch(88.5% 0.046 23.1)
-
Step 300
300
#F1ACA8
oklch(80.9% 0.082 22.8)
-
Step 400
400
#E77D79
oklch(70.7% 0.132 23.2)
-
Step 500
500
#DC5757
oklch(63% 0.167 23.2)
-
Step 600
600
#C8363D
oklch(55.7% 0.182 23)
-
Step 700
700 (this color)
#B63137
oklch(52% 0.169 23.1)
-
Step 800
800
#8C2328
oklch(42.8% 0.14 23)
-
Step 900
900
#702324
oklch(37.6% 0.109 23.3)
-
Step 950
950
#421616
oklch(27% 0.069 22.8)
#B63137 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) | #575136 | 0.184 |
| Deuteranopia (no green cones) | #796D33 | 0.168 |
| Tritanopia (no blue cones) | #C80035 | 0.045 |
| Achromatopsia (no color) | #636363 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B63137
#B63137
oklch(52% 0.169 23.1)
- #00777F
#00777F
oklch(51.9% 0.088 203)
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 #B63137, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.027
- Firebrick #B22222 ΔE 0.027
- Lipstick Red #C0022F ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.038
- Scarlet #BE0119 ΔE 0.040
- Rufous #AE2012 ΔE 0.041
- Brown #A52A2A ΔE 0.041
- Rose Red #BE013C ΔE 0.042
Use #B63137 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.