#B13803
Closest named color: Rusty Red (#AF2F0D). oklch(51.4% 0.165 38.3), rgb(177, 56, 3).
Aa
White text reads best on this color (6.11:1).
About this color
#B13803 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.165 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.018 away. White text reads best on it, at 6.11:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.165) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.43:1 |
| White text | 6.11:1 |
Values
| HEX | #B13803 |
| RGB | rgb(177, 56, 3) |
| HSL | hsl(18, 97%, 35%) |
| OKLCH | oklch(51.4% 0.165 38.3) |
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 #B13803 | 6.11:1 | AA | Lc -84.6 | Fine for body text |
| Black text on #B13803 | 3.43:1 | AA large text | Lc 24.7 | Dividers and decoration only |
| #B13803 text on white | 6.11:1 | AA | Lc 79.4 | Fine for body text |
| #B13803 text on black | 3.43:1 | AA large text | Lc -22.5 | 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 700.
-
Step 50
50
#FCF3F0
oklch(97% 0.011 39.4)
-
Step 100
100
#F9E5DF
oklch(93.6% 0.023 37.4)
-
Step 200
200
#F4D0C4
oklch(88.5% 0.044 39.3)
-
Step 300
300
#EFAF9B
oklch(80.9% 0.081 38.1)
-
Step 400
400
#E48264
oklch(70.7% 0.129 37.8)
-
Step 500
500
#D95F36
oklch(63.2% 0.163 38.6)
-
Step 600
600
#C44006
oklch(55.5% 0.177 38.4)
-
Step 700
700 (this color)
#B13803
oklch(51.4% 0.165 38.3)
-
Step 800
800
#892A02
oklch(42.7% 0.136 38.6)
-
Step 900
900
#6F280F
oklch(37.8% 0.107 38.5)
-
Step 950
950
#41180B
oklch(26.9% 0.068 38)
#B13803 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) | #5D5100 | 0.166 |
| Deuteranopia (no green cones) | #7A6C00 | 0.150 |
| Tritanopia (no blue cones) | #C30830 | 0.069 |
| Achromatopsia (no color) | #626262 | 0.166 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B13803
#B13803
oklch(51.4% 0.165 38.3)
- #00738B
#00738B
oklch(51.3% 0.093 219)
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 #B13803, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.018
- Sinopia #BB3E03 ΔE 0.025
- Russet #A13905 ΔE 0.032
- Rust Red #AA2704 ΔE 0.033
- Burnt Umber #A0450E ΔE 0.037
- Rufous #AE2012 ΔE 0.039
- Brick #A03623 ΔE 0.040
- Firebrick #B22222 ΔE 0.041
Use #B13803 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.