#B33031
Closest named color: Firebrick (#B22222). oklch(51.2% 0.168 25), rgb(179, 48, 49).
Aa
White text reads best on this color (6.20:1).
About this color
#B33031 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.168 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.020 away. White text reads best on it, at 6.20:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.168) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.38:1 |
| White text | 6.20:1 |
Values
| HEX | #B33031 |
| RGB | rgb(179, 48, 49) |
| HSL | hsl(360, 58%, 45%) |
| OKLCH | oklch(51.2% 0.168 25) |
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 #B33031 | 6.20:1 | AA | Lc -84.9 | Fine for body text |
| Black text on #B33031 | 3.38:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #B33031 text on white | 6.20:1 | AA | Lc 79.7 | Fine for body text |
| #B33031 text on black | 3.38:1 | AA large text | Lc -22.1 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#F9E4E2
oklch(93.5% 0.023 24.1)
-
Step 200
200
#F6CECA
oklch(88.4% 0.046 24.8)
-
Step 300
300
#F1ADA6
oklch(81% 0.081 25.6)
-
Step 400
400
#E67E77
oklch(70.7% 0.13 24.9)
-
Step 500
500
#DC5854
oklch(63.1% 0.167 24.8)
-
Step 600
600
#C73838
oklch(55.6% 0.18 25.2)
-
Step 700
700 (this color)
#B33031
oklch(51.2% 0.168 25)
-
Step 800
800
#8B2425
oklch(42.7% 0.138 24.8)
-
Step 900
900
#702422
oklch(37.7% 0.108 25.3)
-
Step 950
950
#421615
oklch(27% 0.069 24.1)
#B33031 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) | #564F30 | 0.181 |
| Deuteranopia (no green cones) | #776B2C | 0.166 |
| Tritanopia (no blue cones) | #C50032 | 0.045 |
| Achromatopsia (no color) | #616161 | 0.169 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B33031
#B33031
oklch(51.2% 0.168 25)
- #00757F
#00757F
oklch(51.3% 0.088 205.2)
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 #B33031, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.020
- Rusty Red #AF2F0D ΔE 0.030
- Rufous #AE2012 ΔE 0.032
- Brown #A52A2A ΔE 0.033
- Dull Red #BB3F3F ΔE 0.033
- Scarlet #BE0119 ΔE 0.038
- Rust Red #AA2704 ΔE 0.039
- Lipstick Red #C0022F ΔE 0.040
Use #B33031 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.