#B03F17
Closest named color: Sinopia (#BB3E03). oklch(52.1% 0.156 38.1), rgb(176, 63, 23).
Aa
White text reads best on this color (5.88:1).
About this color
#B03F17 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.156 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.022 away. White text reads best on it, at 5.88:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.156) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.56:1 |
| White text | 5.88:1 |
Values
| HEX | #B03F17 |
| RGB | rgb(176, 63, 23) |
| HSL | hsl(16, 77%, 39%) |
| OKLCH | oklch(52.1% 0.156 38.1) |
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 #B03F17 | 5.88:1 | AA | Lc -83.7 | Fine for body text |
| Black text on #B03F17 | 3.56:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #B03F17 text on white | 5.88:1 | AA | Lc 78.5 | Fine for body text |
| #B03F17 text on black | 3.56:1 | AA large text | Lc -23.3 | 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
#ECB09E
oklch(80.8% 0.075 37.4)
-
Step 400
400
#E08568
oklch(70.7% 0.12 38.4)
-
Step 500
500
#D5623E
oklch(63.1% 0.154 37.9)
-
Step 600
600
#C04519
oklch(55.6% 0.167 38.1)
-
Step 700
700 (this color)
#B03F17
oklch(52.1% 0.156 38.1)
-
Step 800
800
#872D0D
oklch(42.7% 0.13 37.9)
-
Step 900
900
#6C2A14
oklch(37.6% 0.1 38.3)
-
Step 950
950
#40190D
oklch(27% 0.065 37.7)
#B03F17 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) | #60540F | 0.156 |
| Deuteranopia (no green cones) | #7C6E10 | 0.142 |
| Tritanopia (no blue cones) | #C21F38 | 0.067 |
| Achromatopsia (no color) | #646464 | 0.157 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03F17
#B03F17
oklch(52.1% 0.156 38.1)
- #00768D
#00768D
oklch(52.2% 0.094 217.7)
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 #B03F17, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.022
- Rusty Red #AF2F0D ΔE 0.027
- Burnt Umber #A0450E ΔE 0.033
- Russet #A13905 ΔE 0.035
- Cinnamon #AC4F06 ΔE 0.036
- Brick #A03623 ΔE 0.042
- Rust Red #AA2704 ΔE 0.042
- Sienna #A0522D ΔE 0.044
Use #B03F17 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.