#BB0308
Closest named color: Scarlet (#BE0119). oklch(49.9% 0.203 28.5), rgb(187, 3, 8).
Aa
White text reads best on this color (6.71:1).
About this color
#BB0308 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.203 and its hue 29°. Its hue sits on the warm side of the wheel. The nearest named color is Scarlet (#BE0119), ΔE 0.011 away. White text reads best on it, at 6.71:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.203) |
| Temperature | warm |
| Nearest name | Scarlet (#BE0119) |
| Black text | 3.12:1 |
| White text | 6.71:1 |
Values
| HEX | #BB0308 |
| RGB | rgb(187, 3, 8) |
| HSL | hsl(358, 97%, 37%) |
| OKLCH | oklch(49.9% 0.203 28.5) |
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 #BB0308 | 6.71:1 | AA | Lc -85.6 | Fine for body text |
| Black text on #BB0308 | 3.12:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #BB0308 text on white | 6.71:1 | AA | Lc 80.4 | Fine for body text |
| #BB0308 text on black | 3.12:1 | AA large text | Lc -21.4 | 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 700.
-
Step 50
50
#FEF2F0
oklch(97% 0.013 28.9)
-
Step 100
100
#FCE3DF
oklch(93.5% 0.028 28.5)
-
Step 200
200
#FBCCC5
oklch(88.4% 0.054 28.1)
-
Step 300
300
#FAA89D
oklch(80.9% 0.099 27.8)
-
Step 400
400
#F37566
oklch(70.7% 0.158 28.6)
-
Step 500
500
#EA483B
oklch(63.1% 0.201 28.7)
-
Step 600
600
#D51715
oklch(55.5% 0.218 28.5)
-
Step 700
700 (this color)
#BB0308
oklch(49.9% 0.203 28.5)
-
Step 800
800
#960C0B
oklch(42.8% 0.168 28.5)
-
Step 900
900
#781913
oklch(37.7% 0.131 28.7)
-
Step 950
950
#47110D
oklch(27% 0.083 28.2)
#BB0308 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) | #4E4402 | 0.223 |
| Deuteranopia (no green cones) | #766900 | 0.200 |
| Tritanopia (no blue cones) | #CF000C | 0.042 |
| Achromatopsia (no color) | #5C5C5C | 0.204 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #BB0308
#BB0308
oklch(49.9% 0.203 28.5)
- #00707D
#00707D
oklch(49.9% 0.086 208.8)
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 #BB0308, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Scarlet #BE0119 ΔE 0.011
- Firebrick #B22222 ΔE 0.024
- Rufous #AE2012 ΔE 0.027
- Lipstick Red #C0022F ΔE 0.031
- Rusty Red #AF2F0D ΔE 0.038
- Rust Red #AA2704 ΔE 0.039
- Rose Red #BE013C ΔE 0.046
- Brown #A52A2A ΔE 0.048
Use #BB0308 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.