#A6371F
Closest named color: Brick (#A03623). oklch(49.5% 0.151 33.8), rgb(166, 55, 31).
Aa
White text reads best on this color (6.58:1).
About this color
#A6371F is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.151 and its hue 34°. Its hue sits on the warm side of the wheel. The nearest named color is Brick (#A03623), ΔE 0.013 away. White text reads best on it, at 6.58:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.151) |
| Temperature | warm |
| Nearest name | Brick (#A03623) |
| Black text | 3.18:1 |
| White text | 6.58:1 |
Values
| HEX | #A6371F |
| RGB | rgb(166, 55, 31) |
| HSL | hsl(11, 69%, 39%) |
| OKLCH | oklch(49.5% 0.151 33.8) |
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 #A6371F | 6.58:1 | AA | Lc -86.7 | Fine for body text |
| Black text on #A6371F | 3.18:1 | AA large text | Lc 22.4 | Dividers and decoration only |
| #A6371F text on white | 6.58:1 | AA | Lc 81.6 | Fine for body text |
| #A6371F text on black | 3.18:1 | AA large text | Lc -20.3 | 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
#F8E5E1
oklch(93.6% 0.022 31.8)
-
Step 200
200
#F3D0C8
oklch(88.5% 0.041 33)
-
Step 300
300
#ECB0A2
oklch(80.9% 0.073 33.5)
-
Step 400
400
#DF8470
oklch(70.6% 0.117 33.3)
-
Step 500
500
#D46249
oklch(63.1% 0.15 33.8)
-
Step 600
600
#BF452B
oklch(55.5% 0.162 33.7)
-
Step 700
700 (this color)
#A6371F
oklch(49.5% 0.151 33.8)
-
Step 800
800
#862E1B
oklch(42.8% 0.125 33.8)
-
Step 900
900
#6C2A1C
oklch(37.7% 0.098 33.6)
-
Step 950
950
#3F1911
oklch(26.8% 0.062 33.3)
#A6371F 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) | #574D1B | 0.156 |
| Deuteranopia (no green cones) | #72661A | 0.142 |
| Tritanopia (no blue cones) | #B71532 | 0.057 |
| Achromatopsia (no color) | #5D5D5D | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A6371F
#A6371F
oklch(49.5% 0.151 33.8)
- #006E80
#006E80
oklch(49.5% 0.087 214.1)
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 #A6371F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brick #A03623 ΔE 0.013
- Russet #A13905 ΔE 0.020
- Rusty Red #AF2F0D ΔE 0.020
- Rust Red #AA2704 ΔE 0.024
- Brown #A52A2A ΔE 0.028
- Rufous #AE2012 ΔE 0.031
- Burnt Umber #A0450E ΔE 0.034
- Firebrick #B22222 ΔE 0.035
Use #A6371F 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.