#B53137
Closest named color: Firebrick (#B22222). oklch(51.8% 0.168 23), rgb(181, 49, 55).
Aa
White text reads best on this color (6.07:1).
About this color
#B53137 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.168 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.027 away. White text reads best on it, at 6.07:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.168) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.45:1 |
| White text | 6.07:1 |
Values
| HEX | #B53137 |
| RGB | rgb(181, 49, 55) |
| HSL | hsl(357, 57%, 45%) |
| OKLCH | oklch(51.8% 0.168 23) |
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 #B53137 | 6.07:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #B53137 | 3.45:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #B53137 text on white | 6.07:1 | AA | Lc 79.1 | Fine for body text |
| #B53137 text on black | 3.45:1 | AA large text | Lc -22.7 | 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
#F6CECB
oklch(88.5% 0.046 23.1)
-
Step 300
300
#F1ACA8
oklch(80.9% 0.082 22.8)
-
Step 400
400
#E67D7A
oklch(70.6% 0.13 22.6)
-
Step 500
500
#DC5858
oklch(63.2% 0.166 23.1)
-
Step 600
600
#C7373D
oklch(55.6% 0.18 23.2)
-
Step 700
700 (this color)
#B53137
oklch(51.8% 0.168 23)
-
Step 800
800
#8B2328
oklch(42.6% 0.139 22.9)
-
Step 900
900
#702325
oklch(37.6% 0.109 22.6)
-
Step 950
950
#421616
oklch(27% 0.069 22.8)
#B53137 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) | #575036 | 0.182 |
| Deuteranopia (no green cones) | #786D33 | 0.168 |
| Tritanopia (no blue cones) | #C70035 | 0.045 |
| Achromatopsia (no color) | #626262 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B53137
#B53137
oklch(51.8% 0.168 23)
- #00777F
#00777F
oklch(51.9% 0.088 203)
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 #B53137, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.027
- Dull Red #BB3F3F ΔE 0.028
- Rusty Red #AF2F0D ΔE 0.038
- Lipstick Red #C0022F ΔE 0.038
- Brown #A52A2A ΔE 0.039
- Rufous #AE2012 ΔE 0.040
- Scarlet #BE0119 ΔE 0.040
- Rose Red #BE013C ΔE 0.043
Use #B53137 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.