#A21031
Closest named color: Rouge (#AB1239). oklch(45.8% 0.175 17.5), rgb(162, 16, 49).
Aa
White text reads best on this color (7.91:1).
About this color
#A21031 is a medium-dark, vivid red. In OKLCH its lightness is 46%, its chroma 0.175 and its hue 18°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.022 away. White text reads best on it, at 7.91:1.
| Hue family | Reds |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.175) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.65:1 |
| White text | 7.91:1 |
Values
| HEX | #A21031 |
| RGB | rgb(162, 16, 49) |
| HSL | hsl(346, 82%, 35%) |
| OKLCH | oklch(45.8% 0.175 17.5) |
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 #A21031 | 7.91:1 | AAA | Lc -90.3 | Preferred for body text |
| Black text on #A21031 | 2.65:1 | Fails | Lc 18.5 | Dividers and decoration only |
| #A21031 text on white | 7.91:1 | AAA | Lc 85.5 | Fine for body text |
| #A21031 text on black | 2.65:1 | Fails | Lc -16.6 | 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 800.
-
Step 50
50
#FFF2F2
oklch(97.1% 0.014 17.4)
-
Step 100
100
#FDE2E3
oklch(93.5% 0.03 15.1)
-
Step 200
200
#FDCBCB
oklch(88.6% 0.057 18.3)
-
Step 300
300
#FCA6A8
oklch(81% 0.102 18)
-
Step 400
400
#F5707A
oklch(70.7% 0.163 17.6)
-
Step 500
500
#EC3F59
oklch(63.1% 0.208 17.4)
-
Step 600
600
#D6003F
oklch(55.5% 0.222 17.7)
-
Step 700
700
#B50034
oklch(49% 0.196 17.6)
-
Step 800
800 (this color)
#A21031
oklch(45.8% 0.175 17.5)
-
Step 900
900
#791225
oklch(37.6% 0.136 17.6)
-
Step 950
950
#480E16
oklch(27% 0.087 17.7)
#A21031 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) | #423E31 | 0.195 |
| Deuteranopia (no green cones) | #655C2C | 0.178 |
| Tritanopia (no blue cones) | #B20020 | 0.037 |
| Achromatopsia (no color) | #515151 | 0.176 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A21031
#A21031
oklch(45.8% 0.175 17.5)
- #006467
#006467
oklch(45.7% 0.078 198.4)
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 #A21031, closest first.
No curated palette has a color within ΔE 0.04 of #A21031.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.022
- Cranberry #9E003A ΔE 0.022
- Auburn #9B2226 ΔE 0.027
- Carmine #9D0216 ΔE 0.030
- Brown #A52A2A ΔE 0.036
- Raspberry #B00149 ΔE 0.044
- Purple Red #990147 ΔE 0.045
- Deep Red #9A0200 ΔE 0.045
Use #A21031 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.