#AC3537
Closest named color: Brown (#A52A2A). oklch(50.6% 0.155 23.7), rgb(172, 53, 55).
Aa
White text reads best on this color (6.32:1).
About this color
#AC3537 is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.155 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Brown (#A52A2A), ΔE 0.027 away. White text reads best on it, at 6.32:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.155) |
| Temperature | warm |
| Nearest name | Brown (#A52A2A) |
| Black text | 3.31:1 |
| White text | 6.32:1 |
Values
| HEX | #AC3537 |
| RGB | rgb(172, 53, 55) |
| HSL | hsl(359, 53%, 44%) |
| OKLCH | oklch(50.6% 0.155 23.7) |
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 #AC3537 | 6.32:1 | AA | Lc -85.6 | Fine for body text |
| Black text on #AC3537 | 3.31:1 | AA large text | Lc 23.6 | Dividers and decoration only |
| #AC3537 text on white | 6.32:1 | AA | Lc 80.4 | Fine for body text |
| #AC3537 text on black | 3.31:1 | AA large text | Lc -21.4 | 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
#F4CFCC
oklch(88.5% 0.042 23.5)
-
Step 300
300
#EDAEA9
oklch(80.8% 0.075 24)
-
Step 400
400
#E2817C
oklch(70.7% 0.12 23.7)
-
Step 500
500
#D65D5B
oklch(63% 0.153 23.4)
-
Step 600
600
#C23F41
oklch(55.6% 0.167 23.6)
-
Step 700
700 (this color)
#AC3537
oklch(50.6% 0.155 23.7)
-
Step 800
800
#87292B
oklch(42.6% 0.128 23.3)
-
Step 900
900
#6D2727
oklch(37.7% 0.1 23.2)
-
Step 950
950
#401817
oklch(27% 0.063 23.6)
#AC3537 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) | #564F36 | 0.167 |
| Deuteranopia (no green cones) | #746933 | 0.153 |
| Tritanopia (no blue cones) | #BD1337 | 0.045 |
| Achromatopsia (no color) | #606060 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC3537
#AC3537
oklch(50.6% 0.155 23.7)
- #00737B
#00737B
oklch(50.6% 0.086 203.3)
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 #AC3537, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brown #A52A2A ΔE 0.027
- Firebrick #B22222 ΔE 0.028
- Brick #A03623 ΔE 0.034
- Rusty Red #AF2F0D ΔE 0.034
- Rufous #AE2012 ΔE 0.036
- Dull Red #BB3F3F ΔE 0.038
- Rust Red #AA2704 ΔE 0.040
- Rouge #AB1239 ΔE 0.046
Use #AC3537 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.