#AC1B39
Closest named color: Rouge (#AB1239). oklch(48.4% 0.177 16.8), rgb(172, 27, 57).
Aa
White text reads best on this color (7.07:1).
About this color
#AC1B39 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.177 and its hue 17°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.009 away. White text reads best on it, at 7.07:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.177) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.96:1 |
| White text | 7.07:1 |
Values
| HEX | #AC1B39 |
| RGB | rgb(172, 27, 57) |
| HSL | hsl(348, 73%, 39%) |
| OKLCH | oklch(48.4% 0.177 16.8) |
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 #AC1B39 | 7.07:1 | AAA | Lc -87.8 | Fine for body text |
| Black text on #AC1B39 | 2.96:1 | Fails | Lc 21.3 | Dividers and decoration only |
| #AC1B39 text on white | 7.07:1 | AAA | Lc 82.8 | Fine for body text |
| #AC1B39 text on black | 2.96:1 | 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
#FDF3F3
oklch(97.2% 0.011 17.3)
-
Step 100
100
#FAE4E4
oklch(93.7% 0.024 17.6)
-
Step 200
200
#F7CDCE
oklch(88.5% 0.048 16.5)
-
Step 300
300
#F3AAAD
oklch(80.8% 0.086 16.4)
-
Step 400
400
#E97A82
oklch(70.7% 0.137 16.7)
-
Step 500
500
#DF5262
oklch(63.1% 0.175 17.1)
-
Step 600
600
#CA2E4A
oklch(55.5% 0.191 16.6)
-
Step 700
700 (this color)
#AC1B39
oklch(48.4% 0.177 16.8)
-
Step 800
800
#8E1D31
oklch(42.8% 0.147 16.8)
-
Step 900
900
#72202B
oklch(37.7% 0.114 17)
-
Step 950
950
#431419
oklch(26.9% 0.073 17.1)
#AC1B39 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) | #494539 | 0.197 |
| Deuteranopia (no green cones) | #6D6335 | 0.179 |
| Tritanopia (no blue cones) | #BD0029 | 0.037 |
| Achromatopsia (no color) | #585858 | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC1B39
#AC1B39
oklch(48.4% 0.177 16.8)
- #006D6F
#006D6F
oklch(48.5% 0.083 197)
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 #AC1B39, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.009
- Brown #A52A2A ΔE 0.031
- Raspberry #B00149 ΔE 0.032
- Firebrick #B22222 ΔE 0.034
- Rose Red #BE013C ΔE 0.036
- Lipstick Red #C0022F ΔE 0.041
- Rufous #AE2012 ΔE 0.042
- Cranberry #9E003A ΔE 0.042
Use #AC1B39 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.