#B13021
Closest named color: Rusty Red (#AF2F0D). oklch(50.7% 0.168 30.4), rgb(177, 48, 33).
Aa
White text reads best on this color (6.33:1).
About this color
#B13021 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.168 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.014 away. White text reads best on it, at 6.33:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.168) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.31:1 |
| White text | 6.33:1 |
Values
| HEX | #B13021 |
| RGB | rgb(177, 48, 33) |
| HSL | hsl(6, 69%, 41%) |
| OKLCH | oklch(50.7% 0.168 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 #B13021 | 6.33:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #B13021 | 3.31:1 | AA large text | Lc 23.8 | Dividers and decoration only |
| #B13021 text on white | 6.33:1 | AA | Lc 80.3 | Fine for body text |
| #B13021 text on black | 3.31:1 | AA large text | Lc -21.6 | 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
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#F9E4E1
oklch(93.5% 0.023 27.3)
-
Step 200
200
#F6CFC8
oklch(88.6% 0.045 29.9)
-
Step 300
300
#F1ADA1
oklch(80.9% 0.082 30.2)
-
Step 400
400
#E67F6F
oklch(70.7% 0.13 30)
-
Step 500
500
#DC5A48
oklch(63.2% 0.167 30.3)
-
Step 600
600
#C73A29
oklch(55.6% 0.181 30.4)
-
Step 700
700 (this color)
#B13021
oklch(50.7% 0.168 30.4)
-
Step 800
800
#8B2519
oklch(42.6% 0.139 30.3)
-
Step 900
900
#70251B
oklch(37.7% 0.108 30.4)
-
Step 950
950
#421711
oklch(27% 0.068 30.2)
#B13021 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) | #574D1E | 0.178 |
| Deuteranopia (no green cones) | #776A1B | 0.162 |
| Tritanopia (no blue cones) | #C3002E | 0.051 |
| Achromatopsia (no color) | #606060 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B13021
#B13021
oklch(50.7% 0.168 30.4)
- #007281
#007281
oklch(50.6% 0.088 210.6)
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 #B13021, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.014
- Firebrick #B22222 ΔE 0.019
- Rufous #AE2012 ΔE 0.023
- Rust Red #AA2704 ΔE 0.026
- Brown #A52A2A ΔE 0.031
- Brick #A03623 ΔE 0.033
- Scarlet #BE0119 ΔE 0.039
- Russet #A13905 ΔE 0.040
Use #B13021 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.