#B03E19
Closest named color: Sinopia (#BB3E03). oklch(52% 0.156 37.2), rgb(176, 62, 25).
Aa
White text reads best on this color (5.91:1).
About this color
#B03E19 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.156 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.023 away. White text reads best on it, at 5.91:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.156) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.54:1 |
| White text | 5.91:1 |
Values
| HEX | #B03E19 |
| RGB | rgb(176, 62, 25) |
| HSL | hsl(15, 75%, 39%) |
| OKLCH | oklch(52% 0.156 37.2) |
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 #B03E19 | 5.91:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #B03E19 | 3.54:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #B03E19 text on white | 5.91:1 | AA | Lc 78.6 | Fine for body text |
| #B03E19 text on black | 3.54:1 | AA large text | Lc -23.2 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F8E5E0
oklch(93.6% 0.022 35.1)
-
Step 200
200
#F3D0C6
oklch(88.4% 0.042 36.5)
-
Step 300
300
#EDB09E
oklch(80.9% 0.076 37.1)
-
Step 400
400
#E18469
oklch(70.7% 0.121 37)
-
Step 500
500
#D5623F
oklch(63.1% 0.154 37.5)
-
Step 600
600
#C1441B
oklch(55.6% 0.168 37.2)
-
Step 700
700 (this color)
#B03E19
oklch(52% 0.156 37.2)
-
Step 800
800
#872D0F
oklch(42.7% 0.129 37.4)
-
Step 900
900
#6D2A15
oklch(37.8% 0.101 37.6)
-
Step 950
950
#40190E
oklch(27% 0.064 36.6)
#B03E19 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) | #5F5412 | 0.158 |
| Deuteranopia (no green cones) | #7B6E13 | 0.144 |
| Tritanopia (no blue cones) | #C21D37 | 0.065 |
| Achromatopsia (no color) | #646464 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03E19
#B03E19
oklch(52% 0.156 37.2)
- #00758C
#00758C
oklch(51.9% 0.093 217.8)
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 #B03E19, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.023
- Rusty Red #AF2F0D ΔE 0.025
- Burnt Umber #A0450E ΔE 0.034
- Russet #A13905 ΔE 0.035
- Cinnamon #AC4F06 ΔE 0.038
- Brick #A03623 ΔE 0.040
- Rust Red #AA2704 ΔE 0.041
- Dull Red #BB3F3F ΔE 0.043
Use #B03E19 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.