#AD1D37
Closest named color: Rouge (#AB1239). oklch(48.7% 0.177 18.1), rgb(173, 29, 55).
Aa
White text reads best on this color (6.98:1).
About this color
#AD1D37 is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.177 and its hue 18°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.013 away. White text reads best on it, at 6.98:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.177) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 3.00:1 |
| White text | 6.98:1 |
Values
| HEX | #AD1D37 |
| RGB | rgb(173, 29, 55) |
| HSL | hsl(349, 71%, 40%) |
| OKLCH | oklch(48.7% 0.177 18.1) |
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 #AD1D37 | 6.98:1 | AA | Lc -87.6 | Fine for body text |
| Black text on #AD1D37 | 3.00:1 | AA large text | Lc 21.5 | Dividers and decoration only |
| #AD1D37 text on white | 6.98:1 | AA | Lc 82.5 | Fine for body text |
| #AD1D37 text on black | 3.00:1 | AA large text | Lc -19.4 | 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
#FAE4E4
oklch(93.7% 0.024 17.6)
-
Step 200
200
#F7CDCD
oklch(88.4% 0.048 18.1)
-
Step 300
300
#F3ABAC
oklch(81% 0.085 18.2)
-
Step 400
400
#E97A80
oklch(70.6% 0.137 17.8)
-
Step 500
500
#DF5260
oklch(63.1% 0.176 17.9)
-
Step 600
600
#CA2F47
oklch(55.6% 0.19 17.9)
-
Step 700
700 (this color)
#AD1D37
oklch(48.7% 0.177 18.1)
-
Step 800
800
#8E1E2F
oklch(42.8% 0.146 18.1)
-
Step 900
900
#72202A
oklch(37.7% 0.114 17.7)
-
Step 950
950
#431419
oklch(26.9% 0.073 17.1)
#AD1D37 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) | #4A4637 | 0.197 |
| Deuteranopia (no green cones) | #6E6433 | 0.179 |
| Tritanopia (no blue cones) | #BE0029 | 0.036 |
| Achromatopsia (no color) | #595959 | 0.178 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AD1D37
#AD1D37
oklch(48.7% 0.177 18.1)
- #006E71
#006E71
oklch(48.9% 0.083 198.1)
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 #AD1D37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.013
- Brown #A52A2A ΔE 0.028
- Firebrick #B22222 ΔE 0.029
- Rose Red #BE013C ΔE 0.035
- Raspberry #B00149 ΔE 0.036
- Rufous #AE2012 ΔE 0.038
- Lipstick Red #C0022F ΔE 0.038
- Scarlet #BE0119 ΔE 0.042
Use #AD1D37 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.