#AC1B2B
Closest named color: Firebrick (#B22222). oklch(48.2% 0.178 22.4), rgb(172, 27, 43).
Aa
White text reads best on this color (7.12:1).
About this color
#AC1B2B is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.178 and its hue 22°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.020 away. White text reads best on it, at 7.12:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.178) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 2.94:1 |
| White text | 7.12:1 |
Values
| HEX | #AC1B2B |
| RGB | rgb(172, 27, 43) |
| HSL | hsl(353, 73%, 39%) |
| OKLCH | oklch(48.2% 0.178 22.4) |
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 #AC1B2B | 7.12:1 | AAA | Lc -88.0 | Fine for body text |
| Black text on #AC1B2B | 2.94:1 | Fails | Lc 21.1 | Dividers and decoration only |
| #AC1B2B text on white | 7.12:1 | AAA | Lc 83.0 | Fine for body text |
| #AC1B2B text on black | 2.94:1 | Fails | Lc -19.0 | 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
#FAE4E2
oklch(93.6% 0.024 23.9)
-
Step 200
200
#F7CDCB
oklch(88.4% 0.048 21.3)
-
Step 300
300
#F3ABA7
oklch(80.9% 0.085 22.7)
-
Step 400
400
#EA7B78
oklch(70.7% 0.138 22.8)
-
Step 500
500
#E05356
oklch(63.1% 0.176 22.4)
-
Step 600
600
#CB2F3B
oklch(55.5% 0.191 22.4)
-
Step 700
700 (this color)
#AC1B2B
oklch(48.2% 0.178 22.4)
-
Step 800
800
#8E1E27
oklch(42.7% 0.147 22.2)
-
Step 900
900
#722024
oklch(37.6% 0.115 22)
-
Step 950
950
#431515
oklch(27% 0.072 23.2)
#AC1B2B 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) | #4A442A | 0.197 |
| Deuteranopia (no green cones) | #6E6326 | 0.178 |
| Tritanopia (no blue cones) | #BE0023 | 0.036 |
| Achromatopsia (no color) | #585858 | 0.179 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC1B2B
#AC1B2B
oklch(48.2% 0.178 22.4)
- #006B72
#006B72
oklch(48.1% 0.082 202.7)
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 #AC1B2B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.020
- Brown #A52A2A ΔE 0.020
- Rouge #AB1239 ΔE 0.022
- Rufous #AE2012 ΔE 0.025
- Auburn #9B2226 ΔE 0.035
- Rust Red #AA2704 ΔE 0.036
- Scarlet #BE0119 ΔE 0.037
- Lipstick Red #C0022F ΔE 0.040
Use #AC1B2B 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.