#A64637
Closest named color: Sienna (#A0522D). oklch(51.8% 0.13 30.9), rgb(166, 70, 55).
Aa
White text reads best on this color (5.91:1).
About this color
#A64637 is a medium-dark, moderately saturated red. In OKLCH its lightness is 52%, its chroma 0.130 and its hue 31°. Its hue sits on the warm side of the wheel. The nearest named color is Sienna (#A0522D), ΔE 0.034 away. White text reads best on it, at 5.91:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.130) |
| Temperature | warm |
| Nearest name | Sienna (#A0522D) |
| Black text | 3.55:1 |
| White text | 5.91:1 |
Values
| HEX | #A64637 |
| RGB | rgb(166, 70, 55) |
| HSL | hsl(8, 50%, 43%) |
| OKLCH | oklch(51.8% 0.13 30.9) |
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 #A64637 | 5.91:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #A64637 | 3.55:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #A64637 text on white | 5.91:1 | AA | Lc 78.9 | Fine for body text |
| #A64637 text on black | 3.55:1 | AA large text | Lc -22.9 | 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
#FBF3F2
oklch(97% 0.009 26)
-
Step 100
100
#F6E6E3
oklch(93.7% 0.018 30.3)
-
Step 200
200
#EFD1CB
oklch(88.4% 0.035 31.2)
-
Step 300
300
#E6B2A8
oklch(80.8% 0.063 30.9)
-
Step 400
400
#D8887A
oklch(70.6% 0.101 30.5)
-
Step 500
500
#CB6958
oklch(63.1% 0.128 31.2)
-
Step 600
600
#B74E3D
oklch(55.7% 0.14 31.2)
-
Step 700
700 (this color)
#A64637
oklch(51.8% 0.13 30.9)
-
Step 800
800
#803428
oklch(42.8% 0.108 31)
-
Step 900
900
#672E25
oklch(37.7% 0.084 30.6)
-
Step 950
950
#3D1C16
oklch(27.2% 0.053 31.5)
#A64637 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) | #5F5735 | 0.134 |
| Deuteranopia (no green cones) | #776C35 | 0.123 |
| Tritanopia (no blue cones) | #B63343 | 0.049 |
| Achromatopsia (no color) | #646464 | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A64637
#A64637
oklch(51.8% 0.13 30.9)
- #007686
#007686
oklch(51.9% 0.09 211.1)
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 #A64637, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sienna #A0522D ΔE 0.034
- Brick #A03623 ΔE 0.037
- Burnt Umber #A0450E ΔE 0.037
- Russet #A13905 ΔE 0.043
- Light Maroon #A24857 ΔE 0.043
- Dull Red #BB3F3F ΔE 0.043
- Rusty Red #AF2F0D ΔE 0.044
- Dusty Red #B9484E ΔE 0.048
Use #A64637 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.