#AC0018
Closest named color: Rufous (#AE2012). oklch(46.9% 0.19 25.4), rgb(172, 0, 24).
Aa
White text reads best on this color (7.58:1).
About this color
#AC0018 is a medium-dark, vivid red. In OKLCH its lightness is 47%, its chroma 0.190 and its hue 25°. Its hue sits on the warm side of the wheel. The nearest named color is Rufous (#AE2012), ΔE 0.026 away. White text reads best on it, at 7.58:1.
| Hue family | Reds |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.190) |
| Temperature | warm |
| Nearest name | Rufous (#AE2012) |
| Black text | 2.76:1 |
| White text | 7.58:1 |
Values
| HEX | #AC0018 |
| RGB | rgb(172, 0, 24) |
| HSL | hsl(352, 100%, 34%) |
| OKLCH | oklch(46.9% 0.19 25.4) |
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 #AC0018 | 7.58:1 | AAA | Lc -88.7 | Fine for body text |
| Black text on #AC0018 | 2.76:1 | Fails | Lc 20.3 | Dividers and decoration only |
| #AC0018 text on white | 7.58:1 | AAA | Lc 83.7 | Fine for body text |
| #AC0018 text on black | 2.76:1 | Fails | Lc -18.2 | 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
#FEF2F1
oklch(97% 0.013 23.2)
-
Step 100
100
#FBE4E1
oklch(93.7% 0.026 26.5)
-
Step 200
200
#F9CDC8
oklch(88.5% 0.05 25.7)
-
Step 300
300
#F7AAA2
oklch(81% 0.092 25.9)
-
Step 400
400
#EE7870
oklch(70.7% 0.147 25.5)
-
Step 500
500
#E54E4A
oklch(63.2% 0.188 25.6)
-
Step 600
600
#D0252D
oklch(55.5% 0.204 25.2)
-
Step 700
700 (this color)
#AC0018
oklch(46.9% 0.19 25.4)
-
Step 800
800
#92161C
oklch(42.7% 0.158 25.3)
-
Step 900
900
#751D1D
oklch(37.7% 0.122 25.2)
-
Step 950
950
#451311
oklch(27% 0.077 26)
#AC0018 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) | #463E16 | 0.210 |
| Deuteranopia (no green cones) | #6C600D | 0.190 |
| Tritanopia (no blue cones) | #BE000F | 0.039 |
| Achromatopsia (no color) | #545454 | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC0018
#AC0018
oklch(46.9% 0.19 25.4)
- #006770
#006770
oklch(46.9% 0.08 205.3)
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 #AC0018, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rufous #AE2012 ΔE 0.026
- Firebrick #B22222 ΔE 0.030
- Carmine #9D0216 ΔE 0.032
- Brown #A52A2A ΔE 0.033
- Rouge #AB1239 ΔE 0.034
- Rust Red #AA2704 ΔE 0.036
- Auburn #9B2226 ΔE 0.037
- Burnt Red #9F2305 ΔE 0.037
Use #AC0018 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.