#B13720
Closest named color: Rusty Red (#AF2F0D). oklch(51.4% 0.162 32.8), rgb(177, 55, 32).
Aa
White text reads best on this color (6.11:1).
About this color
#B13720 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.162 and its hue 33°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.016 away. White text reads best on it, at 6.11:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.162) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.43:1 |
| White text | 6.11:1 |
Values
| HEX | #B13720 |
| RGB | rgb(177, 55, 32) |
| HSL | hsl(10, 69%, 41%) |
| OKLCH | oklch(51.4% 0.162 32.8) |
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 #B13720 | 6.11:1 | AA | Lc -84.6 | Fine for body text |
| Black text on #B13720 | 3.43:1 | AA large text | Lc 24.7 | Dividers and decoration only |
| #B13720 text on white | 6.11:1 | AA | Lc 79.4 | Fine for body text |
| #B13720 text on black | 3.43:1 | AA large text | Lc -22.4 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F9E5E0
oklch(93.7% 0.023 34.3)
-
Step 200
200
#F5CFC7
oklch(88.5% 0.044 31.9)
-
Step 300
300
#EFAFA0
oklch(81% 0.079 33.6)
-
Step 400
400
#E4816D
oklch(70.7% 0.126 32.4)
-
Step 500
500
#D95D45
oklch(63.1% 0.161 32.7)
-
Step 600
600
#C43F25
oklch(55.6% 0.174 33)
-
Step 700
700 (this color)
#B13720
oklch(51.4% 0.162 32.8)
-
Step 800
800
#892917
oklch(42.7% 0.134 32.8)
-
Step 900
900
#6E2719
oklch(37.6% 0.104 33)
-
Step 950
950
#411810
oklch(27% 0.066 32.7)
#B13720 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) | #5B511C | 0.169 |
| Deuteranopia (no green cones) | #796C1A | 0.154 |
| Tritanopia (no blue cones) | #C30B33 | 0.059 |
| Achromatopsia (no color) | #626262 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B13720
#B13720
oklch(51.4% 0.162 32.8)
- #007486
#007486
oklch(51.4% 0.09 213.3)
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 #B13720, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.016
- Firebrick #B22222 ΔE 0.030
- Sinopia #BB3E03 ΔE 0.031
- Rust Red #AA2704 ΔE 0.032
- Rufous #AE2012 ΔE 0.033
- Brick #A03623 ΔE 0.035
- Russet #A13905 ΔE 0.037
- Dull Red #BB3F3F ΔE 0.039
Use #B13720 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.