#B51734
Closest named color: Lipstick Red (#C0022F). oklch(49.8% 0.188 19.4), rgb(181, 23, 52).
Aa
White text reads best on this color (6.69:1).
About this color
#B51734 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.188 and its hue 19°. Its hue sits on the warm side of the wheel. The nearest named color is Lipstick Red (#C0022F), ΔE 0.022 away. White text reads best on it, at 6.69:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.188) |
| Temperature | warm |
| Nearest name | Lipstick Red (#C0022F) |
| Black text | 3.13:1 |
| White text | 6.69:1 |
Values
| HEX | #B51734 |
| RGB | rgb(181, 23, 52) |
| HSL | hsl(349, 77%, 40%) |
| OKLCH | oklch(49.8% 0.188 19.4) |
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 #B51734 | 6.69:1 | AA | Lc -86.2 | Fine for body text |
| Black text on #B51734 | 3.13:1 | AA large text | Lc 22.9 | Dividers and decoration only |
| #B51734 text on white | 6.69:1 | AA | Lc 81.1 | Fine for body text |
| #B51734 text on black | 3.13:1 | AA large text | Lc -20.8 | 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
#FEF2F2
oklch(97.1% 0.013 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
#F6A9A9
oklch(80.9% 0.091 19.2)
-
Step 400
400
#ED777B
oklch(70.6% 0.146 19.4)
-
Step 500
500
#E44D5A
oklch(63.2% 0.186 19.4)
-
Step 600
600
#CF2540
oklch(55.6% 0.202 19.4)
-
Step 700
700 (this color)
#B51734
oklch(49.8% 0.188 19.4)
-
Step 800
800
#91162A
oklch(42.7% 0.156 19.3)
-
Step 900
900
#741D26
oklch(37.7% 0.12 19.6)
-
Step 950
950
#451317
oklch(27.1% 0.077 19.3)
#B51734 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) | #4C4734 | 0.209 |
| Deuteranopia (no green cones) | #72672F | 0.189 |
| Tritanopia (no blue cones) | #C70025 | 0.038 |
| Achromatopsia (no color) | #5C5C5C | 0.189 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B51734
#B51734
oklch(49.8% 0.188 19.4)
- #007175
#007175
oklch(49.8% 0.085 199.1)
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 #B51734, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Lipstick Red #C0022F ΔE 0.022
- Rose Red #BE013C ΔE 0.023
- Rouge #AB1239 ΔE 0.025
- Firebrick #B22222 ΔE 0.025
- Scarlet #BE0119 ΔE 0.029
- Rufous #AE2012 ΔE 0.037
- Brown #A52A2A ΔE 0.038
- Raspberry #B00149 ΔE 0.039
Use #B51734 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.