#BB370C
Closest named color: Sinopia (#BB3E03). oklch(53% 0.175 36), rgb(187, 55, 12).
Aa
White text reads best on this color (5.73:1).
About this color
#BB370C is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.175 and its hue 36°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.013 away. White text reads best on it, at 5.73:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.175) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.66:1 |
| White text | 5.73:1 |
Values
| HEX | #BB370C |
| RGB | rgb(187, 55, 12) |
| HSL | hsl(15, 88%, 39%) |
| OKLCH | oklch(53% 0.175 36) |
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 #BB370C | 5.73:1 | AA | Lc -82.7 | Fine for body text |
| Black text on #BB370C | 3.66:1 | AA large text | Lc 26.7 | Dividers and decoration only |
| #BB370C text on white | 5.73:1 | AA | Lc 77.4 | Fine for body text |
| #BB370C text on black | 3.66:1 | AA large text | Lc -24.4 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F9E5E0
oklch(93.7% 0.023 34.3)
-
Step 200
200
#F4D0C6
oklch(88.5% 0.043 36)
-
Step 300
300
#EFAF9E
oklch(80.9% 0.079 35.4)
-
Step 400
400
#E38268
oklch(70.6% 0.126 35.9)
-
Step 500
500
#D85E3E
oklch(63% 0.161 35.7)
-
Step 600
600 (this color)
#BB370C
oklch(53% 0.175 36)
-
Step 700
700
#A93008
oklch(49.1% 0.163 35.9)
-
Step 800
800
#892A0E
oklch(42.7% 0.135 36)
-
Step 900
900
#6E2814
oklch(37.7% 0.105 36.5)
-
Step 950
950
#41180D
oklch(27% 0.067 36)
#BB370C 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) | #5F5300 | 0.181 |
| Deuteranopia (no green cones) | #807100 | 0.163 |
| Tritanopia (no blue cones) | #CE0030 | 0.065 |
| Achromatopsia (no color) | #666666 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #BB370C
#BB370C
oklch(53% 0.175 36)
- #00798E
#00798E
oklch(53% 0.094 215.4)
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 #BB370C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.013
- Rusty Red #AF2F0D ΔE 0.030
- Brick Orange #C14A09 ΔE 0.038
- Dull Red #BB3F3F ΔE 0.040
- Firebrick #B22222 ΔE 0.044
- Burnt Orange #C04E01 ΔE 0.046
- Rust Red #AA2704 ΔE 0.047
- Rufous #AE2012 ΔE 0.047
Use #BB370C 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.