#AC243A
Closest named color: Rouge (#AB1239). oklch(49.1% 0.171 18), rgb(172, 36, 58).
Aa
White text reads best on this color (6.84:1).
About this color
#AC243A is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.171 and its hue 18°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.019 away. White text reads best on it, at 6.84:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.171) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 3.06:1 |
| White text | 6.84:1 |
Values
| HEX | #AC243A |
| RGB | rgb(172, 36, 58) |
| HSL | hsl(350, 65%, 41%) |
| OKLCH | oklch(49.1% 0.171 18) |
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 #AC243A | 6.84:1 | AA | Lc -87.3 | Fine for body text |
| Black text on #AC243A | 3.06:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #AC243A text on white | 6.84:1 | AA | Lc 82.2 | Fine for body text |
| #AC243A text on black | 3.06:1 | AA large text | Lc -19.7 | 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
#F6CECE
oklch(88.6% 0.045 18)
-
Step 300
300
#F1ABAD
oklch(80.8% 0.083 17.2)
-
Step 400
400
#E77C81
oklch(70.7% 0.132 18.1)
-
Step 500
500
#DC5562
oklch(63% 0.169 17.7)
-
Step 600
600
#C83449
oklch(55.7% 0.184 17.9)
-
Step 700
700 (this color)
#AC243A
oklch(49.1% 0.171 18)
-
Step 800
800
#8C2130
oklch(42.7% 0.142 18.1)
-
Step 900
900
#70222B
oklch(37.6% 0.11 17.5)
-
Step 950
950
#421519
oklch(26.9% 0.07 17.8)
#AC243A 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) | #4C483A | 0.189 |
| Deuteranopia (no green cones) | #6E6536 | 0.174 |
| Tritanopia (no blue cones) | #BD002E | 0.036 |
| Achromatopsia (no color) | #5A5A5A | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC243A
#AC243A
oklch(49.1% 0.171 18)
- #006F72
#006F72
oklch(49.2% 0.084 198.1)
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 #AC243A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.019
- Brown #A52A2A ΔE 0.026
- Firebrick #B22222 ΔE 0.029
- Rose Red #BE013C ΔE 0.038
- Rufous #AE2012 ΔE 0.038
- Raspberry #B00149 ΔE 0.039
- Lipstick Red #C0022F ΔE 0.041
- Auburn #9B2226 ΔE 0.043
Use #AC243A 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.