#B03404
Closest named color: Rusty Red (#AF2F0D). oklch(50.8% 0.167 37), rgb(176, 52, 4).
Aa
White text reads best on this color (6.28:1).
About this color
#B03404 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.167 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.010 away. White text reads best on it, at 6.28:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.167) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.33:1 |
| White text | 6.28:1 |
Values
| HEX | #B03404 |
| RGB | rgb(176, 52, 4) |
| HSL | hsl(17, 96%, 35%) |
| OKLCH | oklch(50.8% 0.167 37) |
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 #B03404 | 6.28:1 | AA | Lc -85.3 | Fine for body text |
| Black text on #B03404 | 3.33:1 | AA large text | Lc 24.0 | Dividers and decoration only |
| #B03404 text on white | 6.28:1 | AA | Lc 80.1 | Fine for body text |
| #B03404 text on black | 3.33:1 | AA large text | Lc -21.8 | 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
#F9E5DF
oklch(93.6% 0.023 37.4)
-
Step 200
200
#F5D0C5
oklch(88.6% 0.045 37.2)
-
Step 300
300
#F0AF9C
oklch(81% 0.081 36.9)
-
Step 400
400
#E58165
oklch(70.7% 0.13 36.5)
-
Step 500
500
#DA5D38
oklch(63.1% 0.166 37)
-
Step 600
600
#C63E0C
oklch(55.7% 0.18 37.1)
-
Step 700
700 (this color)
#B03404
oklch(50.8% 0.167 37)
-
Step 800
800
#8A2805
oklch(42.6% 0.139 36.9)
-
Step 900
900
#6F2711
oklch(37.7% 0.108 37)
-
Step 950
950
#41180C
oklch(26.9% 0.067 37)
#B03404 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) | #5A4E00 | 0.171 |
| Deuteranopia (no green cones) | #786A00 | 0.154 |
| Tritanopia (no blue cones) | #C2002D | 0.065 |
| Achromatopsia (no color) | #606060 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03404
#B03404
oklch(50.8% 0.167 37)
- #007287
#007287
oklch(50.9% 0.091 216.4)
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 #B03404, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.010
- Rust Red #AA2704 ΔE 0.026
- Russet #A13905 ΔE 0.030
- Sinopia #BB3E03 ΔE 0.031
- Rufous #AE2012 ΔE 0.032
- Firebrick #B22222 ΔE 0.035
- Brick #A03623 ΔE 0.035
- Burnt Umber #A0450E ΔE 0.039
Use #B03404 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.