#B03A05
Closest named color: Rusty Red (#AF2F0D). oklch(51.4% 0.162 38.9), rgb(176, 58, 5).
Aa
White text reads best on this color (6.08:1).
About this color
#B03A05 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.162 and its hue 39°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.020 away. White text reads best on it, at 6.08:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.162) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.45:1 |
| White text | 6.08:1 |
Values
| HEX | #B03A05 |
| RGB | rgb(176, 58, 5) |
| HSL | hsl(19, 94%, 35%) |
| OKLCH | oklch(51.4% 0.162 38.9) |
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 #B03A05 | 6.08:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #B03A05 | 3.45:1 | AA large text | Lc 24.8 | Dividers and decoration only |
| #B03A05 text on white | 6.08:1 | AA | Lc 79.3 | Fine for body text |
| #B03A05 text on black | 3.45:1 | AA large text | Lc -22.5 | 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
#FCF3F0
oklch(97% 0.011 39.4)
-
Step 100
100
#F8E5DF
oklch(93.5% 0.022 38.3)
-
Step 200
200
#F4D0C4
oklch(88.5% 0.044 39.3)
-
Step 300
300
#EEB09B
oklch(81% 0.079 39.5)
-
Step 400
400
#E28364
oklch(70.6% 0.125 38.8)
-
Step 500
500
#D86037
oklch(63.2% 0.161 38.8)
-
Step 600
600
#C34208
oklch(55.6% 0.174 39)
-
Step 700
700 (this color)
#B03A05
oklch(51.4% 0.162 38.9)
-
Step 800
800
#882B03
oklch(42.6% 0.134 39)
-
Step 900
900
#6E2910
oklch(37.8% 0.105 39)
-
Step 950
950
#41190B
oklch(27.1% 0.067 39.3)
#B03A05 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) | #5D5100 | 0.163 |
| Deuteranopia (no green cones) | #7A6C00 | 0.147 |
| Tritanopia (no blue cones) | #C21132 | 0.070 |
| Achromatopsia (no color) | #626262 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03A05
#B03A05
oklch(51.4% 0.162 38.9)
- #00738B
#00738B
oklch(51.3% 0.093 219)
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 #B03A05, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.020
- Sinopia #BB3E03 ΔE 0.025
- Russet #A13905 ΔE 0.031
- Burnt Umber #A0450E ΔE 0.034
- Rust Red #AA2704 ΔE 0.035
- Brick #A03623 ΔE 0.039
- Cinnamon #AC4F06 ΔE 0.041
- Rufous #AE2012 ΔE 0.042
Use #B03A05 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.