#AD2737
Closest named color: Brown (#A52A2A). oklch(49.4% 0.169 20), rgb(173, 39, 55).
Aa
White text reads best on this color (6.72:1).
About this color
#AD2737 is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.169 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Brown (#A52A2A), ΔE 0.023 away. White text reads best on it, at 6.72:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.169) |
| Temperature | warm |
| Nearest name | Brown (#A52A2A) |
| Black text | 3.12:1 |
| White text | 6.72:1 |
Values
| HEX | #AD2737 |
| RGB | rgb(173, 39, 55) |
| HSL | hsl(353, 63%, 42%) |
| OKLCH | oklch(49.4% 0.169 20) |
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 #AD2737 | 6.72:1 | AA | Lc -86.9 | Fine for body text |
| Black text on #AD2737 | 3.12:1 | AA large text | Lc 22.3 | Dividers and decoration only |
| #AD2737 text on white | 6.72:1 | AA | Lc 81.8 | Fine for body text |
| #AD2737 text on black | 3.12:1 | AA large text | Lc -20.1 | 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
#FAE4E3
oklch(93.6% 0.024 20.7)
-
Step 200
200
#F6CECD
oklch(88.5% 0.045 19.7)
-
Step 300
300
#F1ACAB
oklch(80.9% 0.082 19.9)
-
Step 400
400
#E77D7E
oklch(70.8% 0.131 20.3)
-
Step 500
500
#DC565E
oklch(63% 0.168 19.8)
-
Step 600
600
#C73544
oklch(55.5% 0.182 20.1)
-
Step 700
700 (this color)
#AD2737
oklch(49.4% 0.169 20)
-
Step 800
800
#8C222D
oklch(42.8% 0.141 20.1)
-
Step 900
900
#702328
oklch(37.7% 0.109 20.3)
-
Step 950
950
#421618
oklch(27% 0.068 20.2)
#AD2737 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) | #4E4A37 | 0.187 |
| Deuteranopia (no green cones) | #706633 | 0.171 |
| Tritanopia (no blue cones) | #BE002E | 0.037 |
| Achromatopsia (no color) | #5C5C5C | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AD2737
#AD2737
oklch(49.4% 0.169 20)
- #007074
#007074
oklch(49.5% 0.084 199.1)
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 #AD2737, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brown #A52A2A ΔE 0.023
- Firebrick #B22222 ΔE 0.023
- Rouge #AB1239 ΔE 0.025
- Rufous #AE2012 ΔE 0.033
- Lipstick Red #C0022F ΔE 0.039
- Rose Red #BE013C ΔE 0.040
- Scarlet #BE0119 ΔE 0.042
- Rust Red #AA2704 ΔE 0.043
Use #AD2737 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.