#BB3F17
Closest named color: Sinopia (#BB3E03). oklch(54% 0.167 36.8), rgb(187, 63, 23).
Aa
White text reads best on this color (5.47:1).
About this color
#BB3F17 is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.167 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.008 away. White text reads best on it, at 5.47:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.167) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.83:1 |
| White text | 5.47:1 |
Values
| HEX | #BB3F17 |
| RGB | rgb(187, 63, 23) |
| HSL | hsl(15, 78%, 41%) |
| OKLCH | oklch(54% 0.167 36.8) |
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 #BB3F17 | 5.47:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #BB3F17 | 3.83:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #BB3F17 text on white | 5.47:1 | AA | Lc 76.3 | Fine for body text |
| #BB3F17 text on black | 3.83:1 | AA large text | Lc -25.5 | 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
#F8E5E0
oklch(93.6% 0.022 35.1)
-
Step 200
200
#F3D0C6
oklch(88.4% 0.042 36.5)
-
Step 300
300
#ECB09F
oklch(80.8% 0.075 36.4)
-
Step 400
400
#E0846A
oklch(70.6% 0.12 36.6)
-
Step 500
500
#D56240
oklch(63.1% 0.153 37.2)
-
Step 600
600 (this color)
#BB3F17
oklch(54% 0.167 36.8)
-
Step 700
700
#A6350F
oklch(49.2% 0.155 36.9)
-
Step 800
800
#872D11
oklch(42.8% 0.129 36.8)
-
Step 900
900
#6C2A16
oklch(37.7% 0.1 37.3)
-
Step 950
950
#40190E
oklch(27% 0.064 36.6)
#BB3F17 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) | #64580F | 0.169 |
| Deuteranopia (no green cones) | #82730E | 0.153 |
| Tritanopia (no blue cones) | #CE1738 | 0.068 |
| Achromatopsia (no color) | #696969 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #BB3F17
#BB3F17
oklch(54% 0.167 36.8)
- #007C93
#007C93
oklch(54.1% 0.096 216.8)
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 #BB3F17, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.008
- Brick Orange #C14A09 ΔE 0.028
- Burnt Orange #C04E01 ΔE 0.035
- Dull Red #BB3F3F ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.040
- Burnt Siena #B75203 ΔE 0.040
- Cinnamon #AC4F06 ΔE 0.042
- Rust Orange #C45508 ΔE 0.051
Use #BB3F17 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.