#403665
Closest named color: Prussian Blue (#1D3557). oklch(36.7% 0.079 291.8), rgb(64, 54, 101).
Aa
White text reads best on this color (10.86:1).
About this color
#403665 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.079 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 0.060 away. White text reads best on it, at 10.86:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.079) |
| Temperature | in between |
| Nearest name | Prussian Blue (#1D3557) |
| Black text | 1.93:1 |
| White text | 10.86:1 |
Values
| HEX | #403665 |
| RGB | rgb(64, 54, 101) |
| HSL | hsl(253, 30%, 30%) |
| OKLCH | oklch(36.7% 0.079 291.8) |
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 #403665 | 10.86:1 | AAA | Lc -98.9 | Preferred for body text |
| Black text on #403665 | 1.93:1 | Fails | Lc 8.8 | Not readable |
| #403665 text on white | 10.86:1 | AAA | Lc 95.1 | Preferred for body text |
| #403665 text on black | 1.93:1 | Fails | Lc -7.6 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#EAE8F5
oklch(93.6% 0.018 293.1)
-
Step 200
200
#D9D6EE
oklch(88.6% 0.033 291.5)
-
Step 300
300
#C1BAE5
oklch(80.9% 0.06 292.5)
-
Step 400
400
#A196D8
oklch(70.7% 0.096 291.4)
-
Step 500
500
#8B7BCD
oklch(63.2% 0.122 291.5)
-
Step 600
600
#7662BA
oklch(55.6% 0.133 291.9)
-
Step 700
700
#6351A0
oklch(49.1% 0.123 291.7)
-
Step 800
800
#514382
oklch(42.8% 0.102 291.7)
-
Step 900
900 (this color)
#403665
oklch(36.7% 0.079 291.8)
-
Step 950
950
#27223D
oklch(27.1% 0.049 291.2)
#403665 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) | #273E67 | 0.041 |
| Deuteranopia (no green cones) | #283C64 | 0.039 |
| Tritanopia (no blue cones) | #373F48 | 0.066 |
| Achromatopsia (no color) | #3D3D3D | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403665
#403665
oklch(36.7% 0.079 291.8)
- #404202
#404202
oklch(36.5% 0.079 111.7)
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 #403665, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Prussian Blue #1D3557 ΔE 0.060
- Dark Grey Blue #29465B ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.067
- Dark Blue Grey #1F3B4D ΔE 0.070
- Twilight Blue #0A437A ΔE 0.070
- Marine Blue #01386A ΔE 0.070
- Onyx #343A40 ΔE 0.074
- Charcoal #264653 ΔE 0.074
Use #403665 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.