#B13B33
Closest named color: Dull Red (#BB3F3F). oklch(52.1% 0.155 27.6), rgb(177, 59, 51).
Aa
White text reads best on this color (5.92:1).
About this color
#B13B33 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.155 and its hue 28°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.026 away. White text reads best on it, at 5.92:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.155) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.54:1 |
| White text | 5.92:1 |
Values
| HEX | #B13B33 |
| RGB | rgb(177, 59, 51) |
| HSL | hsl(4, 55%, 45%) |
| OKLCH | oklch(52.1% 0.155 27.6) |
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 #B13B33 | 5.92:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #B13B33 | 3.54:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #B13B33 text on white | 5.92:1 | AA | Lc 78.7 | Fine for body text |
| #B13B33 text on black | 3.54:1 | AA large text | Lc -23.1 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F8E5E2
oklch(93.6% 0.021 28.3)
-
Step 200
200
#F4CFCA
oklch(88.5% 0.042 27)
-
Step 300
300
#EDAFA6
oklch(80.9% 0.074 28.1)
-
Step 400
400
#E28277
oklch(70.8% 0.12 27.4)
-
Step 500
500
#D65F53
oklch(63.1% 0.153 28)
-
Step 600
600
#C24138
oklch(55.7% 0.166 27.7)
-
Step 700
700 (this color)
#B13B33
oklch(52.1% 0.155 27.6)
-
Step 800
800
#872A24
oklch(42.6% 0.128 27.6)
-
Step 900
900
#6D2822
oklch(37.7% 0.1 27.8)
-
Step 950
950
#401814
oklch(26.9% 0.063 27.8)
#B13B33 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) | #5C5431 | 0.164 |
| Deuteranopia (no green cones) | #796D2F | 0.150 |
| Tritanopia (no blue cones) | #C31B3A | 0.050 |
| Achromatopsia (no color) | #646464 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B13B33
#B13B33
oklch(52.1% 0.155 27.6)
- #007784
#007784
oklch(52.1% 0.09 208.1)
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 #B13B33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.026
- Rusty Red #AF2F0D ΔE 0.032
- Firebrick #B22222 ΔE 0.035
- Sinopia #BB3E03 ΔE 0.040
- Dusty Red #B9484E ΔE 0.040
- Brick #A03623 ΔE 0.040
- Brown #A52A2A ΔE 0.041
- Rufous #AE2012 ΔE 0.043
Use #B13B33 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.