#AD1831
Closest named color: Rouge (#AB1239). oklch(48.3% 0.18 19.8), rgb(173, 24, 49).
Aa
White text reads best on this color (7.11:1).
About this color
#AD1831 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.180 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.014 away. White text reads best on it, at 7.11:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.180) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.95:1 |
| White text | 7.11:1 |
Values
| HEX | #AD1831 |
| RGB | rgb(173, 24, 49) |
| HSL | hsl(350, 76%, 39%) |
| OKLCH | oklch(48.3% 0.18 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 #AD1831 | 7.11:1 | AAA | Lc -87.9 | Fine for body text |
| Black text on #AD1831 | 2.95:1 | Fails | Lc 21.2 | Dividers and decoration only |
| #AD1831 text on white | 7.11:1 | AAA | Lc 82.8 | Fine for body text |
| #AD1831 text on black | 2.95:1 | Fails | Lc -19.1 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FBE4E3
oklch(93.7% 0.025 20.6)
-
Step 200
200
#F8CDCC
oklch(88.5% 0.049 19.7)
-
Step 300
300
#F4AAAA
oklch(80.9% 0.088 19.1)
-
Step 400
400
#EB7A7C
oklch(70.8% 0.14 20.1)
-
Step 500
500
#E1515B
oklch(63.1% 0.179 19.9)
-
Step 600
600
#CC2D41
oklch(55.7% 0.194 20)
-
Step 700
700 (this color)
#AD1831
oklch(48.3% 0.18 19.8)
-
Step 800
800
#8F1C2B
oklch(42.8% 0.149 19.8)
-
Step 900
900
#731F27
oklch(37.7% 0.117 19.6)
-
Step 950
950
#441417
oklch(27.1% 0.074 19.9)
#AD1831 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) | #494431 | 0.200 |
| Deuteranopia (no green cones) | #6D632C | 0.183 |
| Tritanopia (no blue cones) | #BF0024 | 0.037 |
| Achromatopsia (no color) | #585858 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AD1831
#AD1831
oklch(48.3% 0.18 19.8)
- #006C71
#006C71
oklch(48.3% 0.082 200.4)
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 #AD1831, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.014
- Firebrick #B22222 ΔE 0.026
- Brown #A52A2A ΔE 0.027
- Rufous #AE2012 ΔE 0.033
- Rose Red #BE013C ΔE 0.037
- Lipstick Red #C0022F ΔE 0.038
- Scarlet #BE0119 ΔE 0.039
- Auburn #9B2226 ΔE 0.039
Use #AD1831 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.