#B03A1A
Closest named color: Rusty Red (#AF2F0D). oklch(51.5% 0.16 35.5), rgb(176, 58, 26).
Aa
White text reads best on this color (6.05:1).
About this color
#B03A1A is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.160 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.018 away. White text reads best on it, at 6.05:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.160) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.46:1 |
| White text | 6.05:1 |
Values
| HEX | #B03A1A |
| RGB | rgb(176, 58, 26) |
| HSL | hsl(13, 74%, 40%) |
| OKLCH | oklch(51.5% 0.16 35.5) |
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 #B03A1A | 6.05:1 | AA | Lc -84.5 | Fine for body text |
| Black text on #B03A1A | 3.46:1 | AA large text | Lc 24.8 | Dividers and decoration only |
| #B03A1A text on white | 6.05:1 | AA | Lc 79.2 | Fine for body text |
| #B03A1A text on black | 3.46:1 | AA large text | Lc -22.6 | 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
#F4D0C6
oklch(88.5% 0.043 36)
-
Step 300
300
#EEAF9F
oklch(80.9% 0.078 34.7)
-
Step 400
400
#E2836A
oklch(70.7% 0.123 35.6)
-
Step 500
500
#D76041
oklch(63.1% 0.157 35.7)
-
Step 600
600
#C3411E
oklch(55.6% 0.172 35.4)
-
Step 700
700 (this color)
#B03A1A
oklch(51.5% 0.16 35.5)
-
Step 800
800
#882B12
oklch(42.7% 0.132 35.4)
-
Step 900
900
#6E2817
oklch(37.7% 0.104 34.9)
-
Step 950
950
#40190E
oklch(27% 0.064 36.6)
#B03A1A 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) | #5D5214 | 0.163 |
| Deuteranopia (no green cones) | #7A6C13 | 0.148 |
| Tritanopia (no blue cones) | #C21434 | 0.063 |
| Achromatopsia (no color) | #626262 | 0.161 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B03A1A
#B03A1A
oklch(51.5% 0.16 35.5)
- #007489
#007489
oklch(51.5% 0.092 216.1)
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 #B03A1A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.018
- Sinopia #BB3E03 ΔE 0.027
- Russet #A13905 ΔE 0.033
- Rust Red #AA2704 ΔE 0.034
- Brick #A03623 ΔE 0.036
- Firebrick #B22222 ΔE 0.038
- Burnt Umber #A0450E ΔE 0.038
- Rufous #AE2012 ΔE 0.038
Use #B03A1A 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.