#403660
Closest named color: Prussian Blue (#1D3557). oklch(36.4% 0.072 293.5), rgb(64, 54, 96).
Aa
White text reads best on this color (10.96:1).
About this color
#403660 is a dark, moderately saturated purple. In OKLCH its lightness is 36%, its chroma 0.072 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.056 away. White text reads best on it, at 10.96:1.
| Hue family | Purples |
| Lightness | dark (36%) |
| Chroma | moderately saturated (0.072) |
| Temperature | in between |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.91:1 |
| White text | 10.96:1 |
Values
| HEX | #403660 |
| RGB | rgb(64, 54, 96) |
| HSL | hsl(254, 28%, 29%) |
| OKLCH | oklch(36.4% 0.072 293.5) |
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 #403660 | 10.96:1 | AAA | Lc -99.2 | Preferred for body text |
| Black text on #403660 | 1.91:1 | Fails | Lc 8.6 | Not readable |
| #403660 text on white | 10.96:1 | AAA | Lc 95.3 | Preferred for body text |
| #403660 text on black | 1.91:1 | Fails | Lc -7.3 | 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
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#EAE8F4
oklch(93.6% 0.016 293.7)
-
Step 200
200
#D9D6EC
oklch(88.5% 0.03 292)
-
Step 300
300
#C2BBE1
oklch(81% 0.053 293.6)
-
Step 400
400
#A397D2
oklch(70.8% 0.086 293.4)
-
Step 500
500
#8D7CC6
oklch(63.2% 0.11 293.6)
-
Step 600
600
#7764B2
oklch(55.6% 0.119 293.3)
-
Step 700
700
#645399
oklch(49.1% 0.11 293.1)
-
Step 800
800
#52447C
oklch(42.7% 0.091 293.7)
-
Step 900
900 (this color)
#403660
oklch(36.4% 0.072 293.5)
-
Step 950
950
#27223A
oklch(26.9% 0.044 292.7)
#403660 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) | #2A3D62 | 0.037 |
| Deuteranopia (no green cones) | #2B3C5F | 0.036 |
| Tritanopia (no blue cones) | #393E46 | 0.059 |
| Achromatopsia (no color) | #3C3C3C | 0.072 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403660
#403660
oklch(36.4% 0.072 293.5)
- #3E420E
#3E420E
oklch(36.4% 0.072 113.8)
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 #403660, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.064
- Onyx #343A40 ΔE 0.066
- Space Cadet #2B2D42 ΔE 0.069
- Charcoal #264653 ΔE 0.069
- Gunmetal #293241 ΔE 0.069
- Marine Blue #01386A ΔE 0.071
Use #403660 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.