#A40B37
Closest named color: Rouge (#AB1239). oklch(46.1% 0.179 14.8), rgb(164, 11, 55).
Aa
White text reads best on this color (7.83:1).
About this color
#A40B37 is a medium-dark, vivid red. In OKLCH its lightness is 46%, its chroma 0.179 and its hue 15°. 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 7.83:1.
| Hue family | Reds |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.179) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.68:1 |
| White text | 7.83:1 |
Values
| HEX | #A40B37 |
| RGB | rgb(164, 11, 55) |
| HSL | hsl(343, 87%, 34%) |
| OKLCH | oklch(46.1% 0.179 14.8) |
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 #A40B37 | 7.83:1 | AAA | Lc -90.0 | Fine for body text |
| Black text on #A40B37 | 2.68:1 | Fails | Lc 19.0 | Dividers and decoration only |
| #A40B37 text on white | 7.83:1 | AAA | Lc 85.1 | Fine for body text |
| #A40B37 text on black | 2.68:1 | Fails | Lc -16.9 | 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
#FDF2F3
oklch(97% 0.012 11)
-
Step 100
100
#FAE4E4
oklch(93.7% 0.024 17.6)
-
Step 200
200
#F7CDCF
oklch(88.5% 0.048 14.9)
-
Step 300
300
#F3AAAF
oklch(80.9% 0.086 14.6)
-
Step 400
400
#E97985
oklch(70.6% 0.138 14.5)
-
Step 500
500
#DF5167
oklch(63.1% 0.177 14.6)
-
Step 600
600
#CA2D4E
oklch(55.5% 0.192 14.8)
-
Step 700
700 (this color)
#A40B37
oklch(46.1% 0.179 14.8)
-
Step 800
800
#8E1C34
oklch(42.8% 0.148 14.9)
-
Step 900
900
#721F2D
oklch(37.7% 0.116 15)
-
Step 950
950
#43141B
oklch(27% 0.073 14.5)
#A40B37 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) | #413E37 | 0.200 |
| Deuteranopia (no green cones) | #655C33 | 0.181 |
| Tritanopia (no blue cones) | #B40022 | 0.041 |
| Achromatopsia (no color) | #525252 | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A40B37
#A40B37
oklch(46.1% 0.179 14.8)
- #006666
#006666
oklch(46.2% 0.079 194.8)
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 #A40B37, closest first.
No curated palette has a color within ΔE 0.04 of #A40B37.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.017
- Cranberry #9E003A ΔE 0.018
- Raspberry #B00149 ΔE 0.035
- Auburn #9B2226 ΔE 0.037
- Purple Red #990147 ΔE 0.039
- Carmine #9D0216 ΔE 0.039
- Berry #990F4B ΔE 0.039
- Brown #A52A2A ΔE 0.042
Use #A40B37 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.