#B03537
Closest named color: Firebrick (#B22222). oklch(51.3% 0.159 23.9), rgb(176, 53, 55).
Aa
White text reads best on this color (6.15:1).
About this color
#B03537 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.159 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.028 away. White text reads best on it, at 6.15:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.159) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.41:1 |
| White text | 6.15:1 |
Values
| HEX | #B03537 |
| RGB | rgb(176, 53, 55) |
| HSL | hsl(359, 54%, 45%) |
| OKLCH | oklch(51.3% 0.159 23.9) |
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 #B03537 | 6.15:1 | AA | Lc -84.9 | Fine for body text |
| Black text on #B03537 | 3.41:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #B03537 text on white | 6.15:1 | AA | Lc 79.6 | Fine for body text |
| #B03537 text on black | 3.41:1 | AA large text | Lc -22.2 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F9E4E3
oklch(93.5% 0.023 20.9)
-
Step 200
200
#F4CFCC
oklch(88.5% 0.042 23.5)
-
Step 300
300
#EFAEA9
oklch(81% 0.077 23.9)
-
Step 400
400
#E3807B
oklch(70.7% 0.123 23.7)
-
Step 500
500
#D85C59
oklch(63.1% 0.157 24)
-
Step 600
600
#C43D3F
oklch(55.7% 0.172 23.9)
-
Step 700
700 (this color)
#B03537
oklch(51.3% 0.159 23.9)
-
Step 800
800
#892829
oklch(42.8% 0.132 24.1)
-
Step 900
900
#6E2625
oklch(37.7% 0.103 24.2)
-
Step 950
950
#411716
oklch(27% 0.066 23.9)
#B03537 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) | #575136 | 0.172 |
| Deuteranopia (no green cones) | #766B33 | 0.158 |
| Tritanopia (no blue cones) | #C10F37 | 0.045 |
| Achromatopsia (no color) | #616161 | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03537
#B03537
oklch(51.3% 0.159 23.9)
- #00757E
#00757E
oklch(51.3% 0.087 204.2)
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 #B03537, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.028
- Dull Red #BB3F3F ΔE 0.031
- Brown #A52A2A ΔE 0.033
- Rusty Red #AF2F0D ΔE 0.034
- Rufous #AE2012 ΔE 0.038
- Brick #A03623 ΔE 0.040
- Rust Red #AA2704 ΔE 0.043
- Dusty Red #B9484E ΔE 0.045
Use #B03537 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.