#403664
Closest named color: Prussian Blue (#1D3557). oklch(36.6% 0.078 292.1), rgb(64, 54, 100).
Aa
White text reads best on this color (10.88:1).
About this color
#403664 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.078 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Prussian Blue (#1D3557), ΔE 0.059 away. White text reads best on it, at 10.88:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.078) |
| Temperature | in between |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.92:1 |
| White text | 10.88:1 |
Values
| HEX | #403664 |
| RGB | rgb(64, 54, 100) |
| HSL | hsl(253, 30%, 30%) |
| OKLCH | oklch(36.6% 0.078 292.1) |
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 #403664 | 10.88:1 | AAA | Lc -99.0 | Preferred for body text |
| Black text on #403664 | 1.92:1 | Fails | Lc 8.8 | Not readable |
| #403664 text on white | 10.88:1 | AAA | Lc 95.1 | Preferred for body text |
| #403664 text on black | 1.92:1 | Fails | Lc -7.5 | 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
#EAE8F5
oklch(93.6% 0.018 293.1)
-
Step 200
200
#D9D6ED
oklch(88.5% 0.031 291.7)
-
Step 300
300
#C1BAE4
oklch(80.8% 0.059 292.7)
-
Step 400
400
#A296D6
oklch(70.7% 0.093 292.5)
-
Step 500
500
#8B7BCB
oklch(63.1% 0.119 291.8)
-
Step 600
600
#7663B8
oklch(55.7% 0.129 292)
-
Step 700
700
#63519F
oklch(49% 0.122 291.9)
-
Step 800
800
#514381
oklch(42.8% 0.1 292)
-
Step 900
900 (this color)
#403664
oklch(36.6% 0.078 292.1)
-
Step 950
950
#27223C
oklch(27.1% 0.048 291.7)
#403664 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) | #273E66 | 0.041 |
| Deuteranopia (no green cones) | #283C63 | 0.039 |
| Tritanopia (no blue cones) | #373F48 | 0.065 |
| Achromatopsia (no color) | #3D3D3D | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403664
#403664
oklch(36.6% 0.078 292.1)
- #404205
#404205
oklch(36.5% 0.077 111.7)
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 #403664, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.059
- Dark Grey Blue #29465B ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.068
- Dark Blue Grey #1F3B4D ΔE 0.068
- Marine Blue #01386A ΔE 0.070
- Twilight Blue #0A437A ΔE 0.071
- Onyx #343A40 ΔE 0.072
- Charcoal #264653 ΔE 0.073
Use #403664 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.