#A31D51
Closest named color: Violet Red (#A50055). oklch(47.5% 0.171 4), rgb(163, 29, 81).
Aa
White text reads best on this color (7.36:1).
About this color
#A31D51 is a medium-dark, vivid red. In OKLCH its lightness is 47%, its chroma 0.171 and its hue 4°. Its hue sits on the warm side of the wheel. The nearest named color is Violet Red (#A50055), ΔE 0.023 away. White text reads best on it, at 7.36:1.
| Hue family | Reds |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.171) |
| Temperature | warm |
| Nearest name | Violet Red (#A50055) |
| Black text | 2.85:1 |
| White text | 7.36:1 |
Values
| HEX | #A31D51 |
| RGB | rgb(163, 29, 81) |
| HSL | hsl(337, 70%, 38%) |
| OKLCH | oklch(47.5% 0.171 4) |
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 #A31D51 | 7.36:1 | AAA | Lc -89.0 | Fine for body text |
| Black text on #A31D51 | 2.85:1 | Fails | Lc 20.0 | Dividers and decoration only |
| #A31D51 text on white | 7.36:1 | AAA | Lc 84.1 | Fine for body text |
| #A31D51 text on black | 2.85:1 | Fails | Lc -17.9 | 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
#FDF3F4
oklch(97.2% 0.011 10.3)
-
Step 100
100
#F9E4E8
oklch(93.7% 0.024 4.5)
-
Step 200
200
#F5CDD5
oklch(88.5% 0.046 4.6)
-
Step 300
300
#EFABBA
oklch(80.9% 0.082 4.5)
-
Step 400
400
#E47B97
oklch(70.7% 0.133 4)
-
Step 500
500
#D9547E
oklch(63.1% 0.17 3.8)
-
Step 600
600
#C43367
oklch(55.6% 0.184 3.9)
-
Step 700
700 (this color)
#A31D51
oklch(47.5% 0.171 4)
-
Step 800
800
#892146
oklch(42.8% 0.141 4.1)
-
Step 900
900
#6E223B
oklch(37.7% 0.11 3.8)
-
Step 950
950
#411522
oklch(27% 0.07 4.6)
#A31D51 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) | #404552 | 0.194 |
| Deuteranopia (no green cones) | #645F4E | 0.173 |
| Tritanopia (no blue cones) | #B20035 | 0.048 |
| Achromatopsia (no color) | #565656 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A31D51
#A31D51
oklch(47.5% 0.171 4)
- #006B61
#006B61
oklch(47.4% 0.084 183.7)
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 #A31D51, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Violet Red #A50055 ΔE 0.023
- Berry #990F4B ΔE 0.028
- Raspberry #B00149 ΔE 0.029
- Dark Fuchsia #9D0759 ΔE 0.032
- Deep Magenta #A0025C ΔE 0.034
- Purple Red #990147 ΔE 0.035
- Rouge #AB1239 ΔE 0.037
- Cranberry #9E003A ΔE 0.037
Use #A31D51 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.