#A63F21
Closest named color: Russet (#A13905). oklch(50.6% 0.143 36.6), rgb(166, 63, 33).
Aa
White text reads best on this color (6.26:1).
About this color
#A63F21 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.143 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Russet (#A13905), ΔE 0.021 away. White text reads best on it, at 6.26:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.143) |
| Temperature | warm |
| Nearest name | Russet (#A13905) |
| Black text | 3.35:1 |
| White text | 6.26:1 |
Values
| HEX | #A63F21 |
| RGB | rgb(166, 63, 33) |
| HSL | hsl(14, 67%, 39%) |
| OKLCH | oklch(50.6% 0.143 36.6) |
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 #A63F21 | 6.26:1 | AA | Lc -85.5 | Fine for body text |
| Black text on #A63F21 | 3.35:1 | AA large text | Lc 23.7 | Dividers and decoration only |
| #A63F21 text on white | 6.26:1 | AA | Lc 80.4 | Fine for body text |
| #A63F21 text on black | 3.35:1 | AA large text | Lc -21.5 | 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
#FBF3F1
oklch(97% 0.009 34.3)
-
Step 100
100
#F7E6E1
oklch(93.7% 0.02 37)
-
Step 200
200
#F1D1C8
oklch(88.5% 0.038 36.2)
-
Step 300
300
#E9B2A2
oklch(81% 0.068 36.8)
-
Step 400
400
#DC876F
oklch(70.7% 0.111 36.6)
-
Step 500
500
#D06648
oklch(63.1% 0.142 36.7)
-
Step 600
600
#BB4A2A
oklch(55.5% 0.153 36.4)
-
Step 700
700 (this color)
#A63F21
oklch(50.6% 0.143 36.6)
-
Step 800
800
#83311A
oklch(42.7% 0.119 36.3)
-
Step 900
900
#692C1B
oklch(37.5% 0.092 36.4)
-
Step 950
950
#3E1B11
oklch(27% 0.058 36.8)
#A63F21 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) | #5C521D | 0.144 |
| Deuteranopia (no green cones) | #75691D | 0.132 |
| Tritanopia (no blue cones) | #B72539 | 0.060 |
| Achromatopsia (no color) | #606060 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A63F21
#A63F21
oklch(50.6% 0.143 36.6)
- #007186
#007186
oklch(50.6% 0.09 216.6)
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 #A63F21, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Russet #A13905 ΔE 0.021
- Burnt Umber #A0450E ΔE 0.023
- Brick #A03623 ΔE 0.024
- Rusty Red #AF2F0D ΔE 0.028
- Rust Red #AA2704 ΔE 0.037
- Sienna #A0522D ΔE 0.039
- Brown #A52A2A ΔE 0.042
- Sinopia #BB3E03 ΔE 0.043
Use #A63F21 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.