#A3373F
Closest named color: Brown (#A52A2A). oklch(49.5% 0.142 19.8), rgb(163, 55, 63).
Aa
White text reads best on this color (6.61:1).
About this color
#A3373F is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.142 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Brown (#A52A2A), ΔE 0.027 away. White text reads best on it, at 6.61:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.142) |
| Temperature | warm |
| Nearest name | Brown (#A52A2A) |
| Black text | 3.17:1 |
| White text | 6.61:1 |
Values
| HEX | #A3373F |
| RGB | rgb(163, 55, 63) |
| HSL | hsl(356, 50%, 43%) |
| OKLCH | oklch(49.5% 0.142 19.8) |
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 #A3373F | 6.61:1 | AA | Lc -86.9 | Fine for body text |
| Black text on #A3373F | 3.17:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #A3373F text on white | 6.61:1 | AA | Lc 81.8 | Fine for body text |
| #A3373F text on black | 3.17:1 | AA large text | Lc -20.1 | 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
#FCF3F3
oklch(97.1% 0.01 17.3)
-
Step 100
100
#F7E5E4
oklch(93.6% 0.02 21.4)
-
Step 200
200
#F2D0CF
oklch(88.6% 0.038 19.9)
-
Step 300
300
#EAAFAE
oklch(80.8% 0.069 19.8)
-
Step 400
400
#DD8484
oklch(70.8% 0.11 20.2)
-
Step 500
500
#D16266
oklch(63.2% 0.141 19.7)
-
Step 600
600
#BC454D
oklch(55.6% 0.153 19.7)
-
Step 700
700 (this color)
#A3373F
oklch(49.5% 0.142 19.8)
-
Step 800
800
#832E33
oklch(42.7% 0.117 20.1)
-
Step 900
900
#6A2A2D
oklch(37.7% 0.092 19.8)
-
Step 950
950
#3E191A
oklch(26.9% 0.058 20.1)
#A3373F 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) | #534E3F | 0.154 |
| Deuteranopia (no green cones) | #6E653C | 0.142 |
| Tritanopia (no blue cones) | #B3203B | 0.039 |
| Achromatopsia (no color) | #5D5D5D | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A3373F
#A3373F
oklch(49.5% 0.142 19.8)
- #007074
#007074
oklch(49.5% 0.084 199.1)
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 #A3373F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brown #A52A2A ΔE 0.027
- Brick #A03623 ΔE 0.033
- Light Maroon #A24857 ΔE 0.039
- Light Burgundy #A8415B ΔE 0.041
- Firebrick #B22222 ΔE 0.042
- Rouge #AB1239 ΔE 0.045
- Auburn #9B2226 ΔE 0.045
- Rufous #AE2012 ΔE 0.047
Use #A3373F 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.