#B52537
Closest named color: Firebrick (#B22222). oklch(50.7% 0.179 20.3), rgb(181, 37, 55).
Aa
White text reads best on this color (6.39:1).
About this color
#B52537 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.179 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.023 away. White text reads best on it, at 6.39:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.179) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.28:1 |
| White text | 6.39:1 |
Values
| HEX | #B52537 |
| RGB | rgb(181, 37, 55) |
| HSL | hsl(353, 66%, 43%) |
| OKLCH | oklch(50.7% 0.179 20.3) |
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 #B52537 | 6.39:1 | AA | Lc -85.4 | Fine for body text |
| Black text on #B52537 | 3.28:1 | AA large text | Lc 23.8 | Dividers and decoration only |
| #B52537 text on white | 6.39:1 | AA | Lc 80.2 | Fine for body text |
| #B52537 text on black | 3.28:1 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FAE4E3
oklch(93.6% 0.024 20.7)
-
Step 200
200
#F8CDCC
oklch(88.5% 0.049 19.7)
-
Step 300
300
#F4ABA9
oklch(81% 0.086 20.9)
-
Step 400
400
#EA7A7C
oklch(70.7% 0.138 20.1)
-
Step 500
500
#E0525B
oklch(63.1% 0.177 20.1)
-
Step 600
600
#CB2E41
oklch(55.6% 0.192 20.1)
-
Step 700
700 (this color)
#B52537
oklch(50.7% 0.179 20.3)
-
Step 800
800
#8E1D2A
oklch(42.6% 0.147 20.5)
-
Step 900
900
#722026
oklch(37.6% 0.115 20.6)
-
Step 950
950
#431417
oklch(26.9% 0.073 19.7)
#B52537 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) | #514B36 | 0.196 |
| Deuteranopia (no green cones) | #756A32 | 0.180 |
| Tritanopia (no blue cones) | #C7002D | 0.037 |
| Achromatopsia (no color) | #5F5F5F | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B52537
#B52537
oklch(50.7% 0.179 20.3)
- #007479
#007479
oklch(50.8% 0.086 200.1)
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 #B52537, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.023
- Lipstick Red #C0022F ΔE 0.027
- Rose Red #BE013C ΔE 0.029
- Scarlet #BE0119 ΔE 0.032
- Rouge #AB1239 ΔE 0.033
- Brown #A52A2A ΔE 0.036
- Rufous #AE2012 ΔE 0.037
- Dull Red #BB3F3F ΔE 0.043
Use #B52537 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.