#BB3A18
Closest named color: Sinopia (#BB3E03). oklch(53.4% 0.171 35), rgb(187, 58, 24).
Aa
White text reads best on this color (5.62:1).
About this color
#BB3A18 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.171 and its hue 35°. 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 5.62:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.171) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.73:1 |
| White text | 5.62:1 |
Values
| HEX | #BB3A18 |
| RGB | rgb(187, 58, 24) |
| HSL | hsl(13, 77%, 41%) |
| OKLCH | oklch(53.4% 0.171 35) |
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 #BB3A18 | 5.62:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #BB3A18 | 3.73:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #BB3A18 text on white | 5.62:1 | AA | Lc 77.0 | Fine for body text |
| #BB3A18 text on black | 3.73:1 | AA large text | Lc -24.8 | 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
#F4D0C6
oklch(88.5% 0.043 36)
-
Step 300
300
#EEAF9F
oklch(80.9% 0.078 34.7)
-
Step 400
400
#E2836B
oklch(70.7% 0.123 35.1)
-
Step 500
500
#D75F42
oklch(63% 0.158 34.9)
-
Step 600
600 (this color)
#BB3A18
oklch(53.4% 0.171 35)
-
Step 700
700
#A83212
oklch(49.2% 0.159 35.1)
-
Step 800
800
#882B13
oklch(42.7% 0.132 35.1)
-
Step 900
900
#6E2817
oklch(37.7% 0.104 34.9)
-
Step 950
950
#40190F
oklch(27% 0.064 35.5)
#BB3A18 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) | #615511 | 0.176 |
| Deuteranopia (no green cones) | #80720F | 0.161 |
| Tritanopia (no blue cones) | #CE0634 | 0.065 |
| Achromatopsia (no color) | #676767 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #BB3A18
#BB3A18
oklch(53.4% 0.171 35)
- #007A8F
#007A8F
oklch(53.3% 0.094 215.3)
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 #BB3A18, 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 0.033
- Dull Red #BB3F3F ΔE 0.035
- Brick Orange #C14A09 ΔE 0.036
- Burnt Orange #C04E01 ΔE 0.044
- Firebrick #B22222 ΔE 0.046
- Cinnamon #AC4F06 ΔE 0.049
- Burnt Siena #B75203 ΔE 0.049
Use #BB3A18 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.