#AC3939
Closest named color: Brown (#A52A2A). oklch(51.1% 0.151 24.2), rgb(172, 57, 57).
Aa
White text reads best on this color (6.17:1).
About this color
#AC3939 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.151 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Brown (#A52A2A), ΔE 0.032 away. White text reads best on it, at 6.17:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.151) |
| Temperature | warm |
| Nearest name | Brown (#A52A2A) |
| Black text | 3.39:1 |
| White text | 6.17:1 |
Values
| HEX | #AC3939 |
| RGB | rgb(172, 57, 57) |
| HSL | hsl(0, 50%, 45%) |
| OKLCH | oklch(51.1% 0.151 24.2) |
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 #AC3939 | 6.17:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #AC3939 | 3.39:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #AC3939 text on white | 6.17:1 | AA | Lc 79.9 | Fine for body text |
| #AC3939 text on black | 3.39:1 | AA large text | Lc -21.9 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F8E5E3
oklch(93.7% 0.021 24.8)
-
Step 200
200
#F3CFCC
oklch(88.4% 0.041 23.6)
-
Step 300
300
#ECAFAA
oklch(80.9% 0.072 24.1)
-
Step 400
400
#E0827D
oklch(70.7% 0.117 23.7)
-
Step 500
500
#D55F5B
oklch(63.1% 0.15 24.3)
-
Step 600
600
#C04242
oklch(55.7% 0.162 24)
-
Step 700
700 (this color)
#AC3939
oklch(51.1% 0.151 24.2)
-
Step 800
800
#862B2B
oklch(42.7% 0.125 24.1)
-
Step 900
900
#6C2827
oklch(37.6% 0.098 23.8)
-
Step 950
950
#401917
oklch(27.2% 0.061 24.9)
#AC3939 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) | #585238 | 0.162 |
| Deuteranopia (no green cones) | #756A36 | 0.148 |
| Tritanopia (no blue cones) | #BD1C3A | 0.045 |
| Achromatopsia (no color) | #616161 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC3939
#AC3939
oklch(51.1% 0.151 24.2)
- #00747D
#00747D
oklch(51% 0.087 204.3)
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 #AC3939, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brown #A52A2A ΔE 0.032
- Firebrick #B22222 ΔE 0.033
- Dull Red #BB3F3F ΔE 0.034
- Brick #A03623 ΔE 0.035
- Rusty Red #AF2F0D ΔE 0.036
- Rufous #AE2012 ΔE 0.041
- Light Maroon #A24857 ΔE 0.043
- Rust Red #AA2704 ΔE 0.044
Use #AC3939 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.