#AC4037
Closest named color: Dull Red (#BB3F3F). oklch(52% 0.144 27.9), rgb(172, 64, 55).
Aa
White text reads best on this color (5.92:1).
About this color
#AC4037 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.144 and its hue 28°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.031 away. White text reads best on it, at 5.92:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.144) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.54:1 |
| White text | 5.92:1 |
Values
| HEX | #AC4037 |
| RGB | rgb(172, 64, 55) |
| HSL | hsl(5, 52%, 45%) |
| OKLCH | oklch(52% 0.144 27.9) |
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 #AC4037 | 5.92:1 | AA | Lc -84.1 | Fine for body text |
| Black text on #AC4037 | 3.54:1 | AA large text | Lc 25.2 | Dividers and decoration only |
| #AC4037 text on white | 5.92:1 | AA | Lc 78.8 | Fine for body text |
| #AC4037 text on black | 3.54:1 | AA large text | Lc -23.0 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F7E5E2
oklch(93.5% 0.02 28.9)
-
Step 200
200
#F2D0CB
oklch(88.5% 0.039 27.8)
-
Step 300
300
#EAB0A8
oklch(80.8% 0.069 27.6)
-
Step 400
400
#DD857A
oklch(70.7% 0.11 27.8)
-
Step 500
500
#D16357
oklch(63% 0.142 28.1)
-
Step 600
600
#BD473D
oklch(55.7% 0.154 27.9)
-
Step 700
700 (this color)
#AC4037
oklch(52% 0.144 27.9)
-
Step 800
800
#842F28
oklch(42.8% 0.119 27.8)
-
Step 900
900
#6A2B25
oklch(37.7% 0.092 27.7)
-
Step 950
950
#3F1A16
oklch(27.1% 0.059 27.9)
#AC4037 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) | #5D5535 | 0.151 |
| Deuteranopia (no green cones) | #786D34 | 0.140 |
| Tritanopia (no blue cones) | #BD283F | 0.048 |
| Achromatopsia (no color) | #646464 | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC4037
#AC4037
oklch(52% 0.144 27.9)
- #007783
#007783
oklch(52% 0.089 207.1)
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 #AC4037, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.031
- Rusty Red #AF2F0D ΔE 0.037
- Brick #A03623 ΔE 0.037
- Dusty Red #B9484E ΔE 0.041
- Brown #A52A2A ΔE 0.043
- Firebrick #B22222 ΔE 0.043
- Light Maroon #A24857 ΔE 0.044
- Sinopia #BB3E03 ΔE 0.045
Use #AC4037 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.