#403166
Closest named color: Prussian Blue (#1D3557). oklch(35.7% 0.09 294.5), rgb(64, 49, 102).
Aa
White text reads best on this color (11.35:1).
About this color
#403166 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.090 and its hue 294°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.062 away. White text reads best on it, at 11.35:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.090) |
| Temperature | in between |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.84:1 |
| White text | 11.35:1 |
Values
| HEX | #403166 |
| RGB | rgb(64, 49, 102) |
| HSL | hsl(257, 35%, 30%) |
| OKLCH | oklch(35.7% 0.09 294.5) |
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 #403166 | 11.35:1 | AAA | Lc -99.8 | Preferred for body text |
| Black text on #403166 | 1.84:1 | Fails | Lc 7.8 | Not readable |
| #403166 text on white | 11.35:1 | AAA | Lc 96.0 | Preferred for body text |
| #403166 text on black | 1.84:1 | Fails | Lc 0.0 | Not readable |
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 900.
-
Step 50
50
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EAE8F6
oklch(93.7% 0.019 292.6)
-
Step 200
200
#DAD5F0
oklch(88.5% 0.037 294.1)
-
Step 300
300
#C3B9E8
oklch(81% 0.066 294.6)
-
Step 400
400
#A593DD
oklch(70.7% 0.108 294.7)
-
Step 500
500
#8F77D4
oklch(63.2% 0.138 294)
-
Step 600
600
#7A5DC1
oklch(55.5% 0.151 294.3)
-
Step 700
700
#674CA6
oklch(49% 0.139 294.5)
-
Step 800
800
#543F87
oklch(42.7% 0.116 294.4)
-
Step 900
900 (this color)
#403166
oklch(35.7% 0.09 294.5)
-
Step 950
950
#28203F
oklch(26.9% 0.057 294.1)
#403166 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) | #1E3B68 | 0.054 |
| Deuteranopia (no green cones) | #213965 | 0.050 |
| Tritanopia (no blue cones) | #373B46 | 0.072 |
| Achromatopsia (no color) | #3A3A3A | 0.090 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403166
#403166
oklch(35.7% 0.09 294.5)
- #3C4100
#3C4100
oklch(35.8% 0.081 114.6)
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 #403166, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.069
- Marine Blue #01386A ΔE 0.072
- Space Cadet #2B2D42 ΔE 0.075
- Dark Grey Blue #29465B ΔE 0.076
- Twilight Blue #0A437A ΔE 0.076
- Dark Blue Grey #1F3B4D ΔE 0.077
- Gunmetal #293241 ΔE 0.079
Use #403166 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.