#B81100
Closest named color: Scarlet (#BE0119). oklch(49.7% 0.197 30.4), rgb(184, 17, 0).
Aa
White text reads best on this color (6.73:1).
About this color
#B81100 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.197 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Scarlet (#BE0119), ΔE 0.019 away. White text reads best on it, at 6.73:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.197) |
| Temperature | warm |
| Nearest name | Scarlet (#BE0119) |
| Black text | 3.11:1 |
| White text | 6.73:1 |
Values
| HEX | #B81100 |
| RGB | rgb(184, 17, 0) |
| HSL | hsl(6, 100%, 36%) |
| OKLCH | oklch(49.7% 0.197 30.4) |
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 #B81100 | 6.73:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #B81100 | 3.11:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #B81100 text on white | 6.73:1 | AA | Lc 80.9 | Fine for body text |
| #B81100 text on black | 3.11:1 | AA large text | Lc -20.9 | 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
#FEF3F0
oklch(97.2% 0.013 35.7)
-
Step 100
100
#FCE4DF
oklch(93.7% 0.027 31.7)
-
Step 200
200
#FACDC4
oklch(88.5% 0.053 31.3)
-
Step 300
300
#F8AA9C
oklch(81% 0.095 30.5)
-
Step 400
400
#F07865
oklch(70.7% 0.152 30.5)
-
Step 500
500
#E74C39
oklch(63% 0.195 30.3)
-
Step 600
600
#D3210E
oklch(55.6% 0.212 30.4)
-
Step 700
700 (this color)
#B81100
oklch(49.7% 0.197 30.4)
-
Step 800
800
#941406
oklch(42.8% 0.163 30.5)
-
Step 900
900
#771C11
oklch(37.8% 0.127 30.6)
-
Step 950
950
#46120C
oklch(27% 0.081 29.8)
#B81100 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) | #4F4500 | 0.214 |
| Deuteranopia (no green cones) | #766800 | 0.189 |
| Tritanopia (no blue cones) | #CC0012 | 0.042 |
| Achromatopsia (no color) | #5C5C5C | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B81100
#B81100
oklch(49.7% 0.197 30.4)
- #006F7E
#006F7E
oklch(49.7% 0.086 211)
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 #B81100, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Scarlet #BE0119 ΔE 0.019
- Rufous #AE2012 ΔE 0.020
- Firebrick #B22222 ΔE 0.021
- Rust Red #AA2704 ΔE 0.030
- Rusty Red #AF2F0D ΔE 0.030
- Lipstick Red #C0022F ΔE 0.038
- Brown #A52A2A ΔE 0.043
- Burnt Red #9F2305 ΔE 0.050
Use #B81100 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.