#AC5537
Closest named color: Sienna (#A0522D). oklch(55% 0.122 39.4), rgb(172, 85, 55).
Aa
White text reads best on this color (5.11:1).
About this color
#AC5537 is a medium-dark, moderately saturated red. In OKLCH its lightness is 55%, its chroma 0.122 and its hue 39°. Its hue sits on the warm side of the wheel. The nearest named color is Sienna (#A0522D), ΔE 0.027 away. White text reads best on it, at 5.11:1.
| Hue family | Reds |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.122) |
| Temperature | warm |
| Nearest name | Sienna (#A0522D) |
| Black text | 4.10:1 |
| White text | 5.11:1 |
Values
| HEX | #AC5537 |
| RGB | rgb(172, 85, 55) |
| HSL | hsl(15, 52%, 45%) |
| OKLCH | oklch(55% 0.122 39.4) |
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 #AC5537 | 5.11:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #AC5537 | 4.10:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #AC5537 text on white | 5.11:1 | AA | Lc 74.8 | Content text, not long reading |
| #AC5537 text on black | 4.10:1 | AA large text | Lc -26.9 | 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 600.
-
Step 50
50
#FAF4F2
oklch(97.1% 0.007 39.5)
-
Step 100
100
#F4E7E2
oklch(93.7% 0.016 42.4)
-
Step 200
200
#ECD3CA
oklch(88.5% 0.031 40.9)
-
Step 300
300
#E1B5A7
oklch(80.9% 0.055 38.4)
-
Step 400
400
#D08E77
oklch(70.7% 0.087 40)
-
Step 500
500
#C37054
oklch(63.1% 0.113 39.3)
-
Step 600
600 (this color)
#AC5537
oklch(55% 0.122 39.4)
-
Step 700
700
#95462B
oklch(49% 0.114 39.2)
-
Step 800
800
#793A25
oklch(42.6% 0.094 38.9)
-
Step 900
900
#623323
oklch(37.8% 0.073 39.4)
-
Step 950
950
#3A1E15
oklch(27.1% 0.047 38.6)
#AC5537 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) | #6C6234 | 0.118 |
| Deuteranopia (no green cones) | #817535 | 0.108 |
| Tritanopia (no blue cones) | #BC444E | 0.059 |
| Achromatopsia (no color) | #6E6E6E | 0.123 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #AC5537
#AC5537
oklch(55% 0.122 39.4)
- #007F99
#007F99
oklch(55.1% 0.1 218.8)
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 #AC5537, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sienna #A0522D ΔE 0.027
- Cinnamon #AC4F06 ΔE 0.032
- Burnt Siena #B75203 ΔE 0.036
- Earth #A2653E ΔE 0.039
- Burnt Orange #C04E01 ΔE 0.045
- Brick Orange #C14A09 ΔE 0.046
- Raw Umber #A75E09 ΔE 0.046
- Sepia #985E2B ΔE 0.046
Use #AC5537 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.