#A63B38
Closest named color: Brick (#A03623). oklch(50.3% 0.142 25.2), rgb(166, 59, 56).
Aa
White text reads best on this color (6.35:1).
About this color
#A63B38 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.142 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Brick (#A03623), ΔE 0.027 away. White text reads best on it, at 6.35:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.142) |
| Temperature | warm |
| Nearest name | Brick (#A03623) |
| Black text | 3.30:1 |
| White text | 6.35:1 |
Values
| HEX | #A63B38 |
| RGB | rgb(166, 59, 56) |
| HSL | hsl(2, 50%, 44%) |
| OKLCH | oklch(50.3% 0.142 25.2) |
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 #A63B38 | 6.35:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #A63B38 | 3.30:1 | AA large text | Lc 23.3 | Dividers and decoration only |
| #A63B38 text on white | 6.35:1 | AA | Lc 80.8 | Fine for body text |
| #A63B38 text on black | 3.30:1 | AA large text | Lc -21.1 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F7E5E3
oklch(93.6% 0.02 25.2)
-
Step 200
200
#F2D0CC
oklch(88.5% 0.039 25.8)
-
Step 300
300
#EAB0AA
oklch(80.9% 0.069 25.4)
-
Step 400
400
#DD857D
oklch(70.8% 0.11 25.8)
-
Step 500
500
#D1635D
oklch(63.2% 0.14 25)
-
Step 600
600
#BC4743
oklch(55.6% 0.152 25.3)
-
Step 700
700 (this color)
#A63B38
oklch(50.3% 0.142 25.2)
-
Step 800
800
#832F2C
oklch(42.7% 0.117 25.3)
-
Step 900
900
#6A2B28
oklch(37.8% 0.091 25.1)
-
Step 950
950
#3E1A17
oklch(27% 0.057 26.4)
#A63B38 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) | #575137 | 0.152 |
| Deuteranopia (no green cones) | #726835 | 0.140 |
| Tritanopia (no blue cones) | #B6233B | 0.043 |
| Achromatopsia (no color) | #5F5F5F | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A63B38
#A63B38
oklch(50.3% 0.142 25.2)
- #00727C
#00727C
oklch(50.4% 0.086 205.5)
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 #A63B38, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brick #A03623 ΔE 0.027
- Brown #A52A2A ΔE 0.029
- Rusty Red #AF2F0D ΔE 0.037
- Firebrick #B22222 ΔE 0.039
- Light Maroon #A24857 ΔE 0.042
- Russet #A13905 ΔE 0.043
- Rust Red #AA2704 ΔE 0.043
- Rufous #AE2012 ΔE 0.043
Use #A63B38 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.