#B21833
Closest named color: Rouge (#AB1239). oklch(49.3% 0.185 19.6), rgb(178, 24, 51).
Aa
White text reads best on this color (6.83:1).
About this color
#B21833 is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.185 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.020 away. White text reads best on it, at 6.83:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.185) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 3.07:1 |
| White text | 6.83:1 |
Values
| HEX | #B21833 |
| RGB | rgb(178, 24, 51) |
| HSL | hsl(349, 76%, 40%) |
| OKLCH | oklch(49.3% 0.185 19.6) |
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 #B21833 | 6.83:1 | AA | Lc -86.8 | Fine for body text |
| Black text on #B21833 | 3.07:1 | AA large text | Lc 22.3 | Dividers and decoration only |
| #B21833 text on white | 6.83:1 | AA | Lc 81.7 | Fine for body text |
| #B21833 text on black | 3.07:1 | AA large text | Lc -20.2 | 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
#FDF2F2
oklch(97% 0.012 17.4)
-
Step 100
100
#FBE3E3
oklch(93.5% 0.026 17.6)
-
Step 200
200
#F9CDCC
oklch(88.6% 0.05 19.7)
-
Step 300
300
#F5AAA9
oklch(81% 0.089 20)
-
Step 400
400
#EC787C
oklch(70.6% 0.143 19.3)
-
Step 500
500
#E24F5B
oklch(63.1% 0.182 19.4)
-
Step 600
600
#CE2841
oklch(55.6% 0.199 19.4)
-
Step 700
700 (this color)
#B21833
oklch(49.3% 0.185 19.6)
-
Step 800
800
#90192A
oklch(42.7% 0.153 19.8)
-
Step 900
900
#741E26
oklch(37.8% 0.119 20)
-
Step 950
950
#441317
oklch(26.9% 0.075 19)
#B21833 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) | #4B4633 | 0.205 |
| Deuteranopia (no green cones) | #71662E | 0.186 |
| Tritanopia (no blue cones) | #C40025 | 0.037 |
| Achromatopsia (no color) | #5B5B5B | 0.186 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B21833
#B21833
oklch(49.3% 0.185 19.6)
- #006F74
#006F74
oklch(49.2% 0.084 200.3)
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 #B21833, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.020
- Firebrick #B22222 ΔE 0.024
- Lipstick Red #C0022F ΔE 0.028
- Rose Red #BE013C ΔE 0.028
- Scarlet #BE0119 ΔE 0.032
- Brown #A52A2A ΔE 0.033
- Rufous #AE2012 ΔE 0.035
- Raspberry #B00149 ΔE 0.039
Use #B21833 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.