#AD1B31
Closest named color: Rouge (#AB1239). oklch(48.5% 0.178 20.2), rgb(173, 27, 49).
Aa
White text reads best on this color (7.05:1).
About this color
#AD1B31 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.178 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.017 away. White text reads best on it, at 7.05:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.178) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.97:1 |
| White text | 7.05:1 |
Values
| HEX | #AD1B31 |
| RGB | rgb(173, 27, 49) |
| HSL | hsl(351, 73%, 39%) |
| OKLCH | oklch(48.5% 0.178 20.2) |
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 #AD1B31 | 7.05:1 | AAA | Lc -87.7 | Fine for body text |
| Black text on #AD1B31 | 2.97:1 | Fails | Lc 21.4 | Dividers and decoration only |
| #AD1B31 text on white | 7.05:1 | AAA | Lc 82.7 | Fine for body text |
| #AD1B31 text on black | 2.97:1 | Fails | Lc -19.2 | 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
#FAE4E3
oklch(93.6% 0.024 20.7)
-
Step 200
200
#F8CDCC
oklch(88.5% 0.049 19.7)
-
Step 300
300
#F3ABA9
oklch(80.9% 0.085 20.9)
-
Step 400
400
#EA7A7C
oklch(70.7% 0.138 20.1)
-
Step 500
500
#E0525B
oklch(63.1% 0.177 20.1)
-
Step 600
600
#CB2E41
oklch(55.6% 0.192 20.1)
-
Step 700
700 (this color)
#AD1B31
oklch(48.5% 0.178 20.2)
-
Step 800
800
#8E1D2B
oklch(42.7% 0.147 20)
-
Step 900
900
#722027
oklch(37.6% 0.115 19.9)
-
Step 950
950
#431417
oklch(26.9% 0.073 19.7)
#AD1B31 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) | #4A4531 | 0.198 |
| Deuteranopia (no green cones) | #6E632C | 0.179 |
| Tritanopia (no blue cones) | #BF0025 | 0.037 |
| Achromatopsia (no color) | #595959 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AD1B31
#AD1B31
oklch(48.5% 0.178 20.2)
- #006D71
#006D71
oklch(48.6% 0.083 199.2)
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 #AD1B31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.017
- Firebrick #B22222 ΔE 0.024
- Brown #A52A2A ΔE 0.025
- Rufous #AE2012 ΔE 0.031
- Lipstick Red #C0022F ΔE 0.038
- Rose Red #BE013C ΔE 0.038
- Scarlet #BE0119 ΔE 0.038
- Auburn #9B2226 ΔE 0.039
Use #AD1B31 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.