#403963
Closest named color: Dark Grey Blue (#29465B). oklch(37.2% 0.071 290.2), rgb(64, 57, 99).
Aa
White text reads best on this color (10.58:1).
About this color
#403963 is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.071 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.054 away. White text reads best on it, at 10.58:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.071) |
| Temperature | in between |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 1.98:1 |
| White text | 10.58:1 |
Values
| HEX | #403963 |
| RGB | rgb(64, 57, 99) |
| HSL | hsl(250, 27%, 31%) |
| OKLCH | oklch(37.2% 0.071 290.2) |
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 #403963 | 10.58:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #403963 | 1.98:1 | Fails | Lc 9.4 | Not readable |
| #403963 text on white | 10.58:1 | AAA | Lc 94.5 | Preferred for body text |
| #403963 text on black | 1.98:1 | Fails | Lc -8.1 | 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
#E9E8F4
oklch(93.5% 0.016 289.9)
-
Step 200
200
#D8D6EC
oklch(88.4% 0.03 289.9)
-
Step 300
300
#C0BBE1
oklch(80.9% 0.053 291.2)
-
Step 400
400
#A098D2
oklch(70.8% 0.084 290.4)
-
Step 500
500
#897DC7
oklch(63.1% 0.11 290.3)
-
Step 600
600
#7365B3
oklch(55.5% 0.119 290.2)
-
Step 700
700
#61549A
oklch(49.1% 0.11 290.3)
-
Step 800
800
#4F457D
oklch(42.7% 0.091 290.2)
-
Step 900
900 (this color)
#403963
oklch(37.2% 0.071 290.2)
-
Step 950
950
#26223B
oklch(26.9% 0.046 290.3)
#403963 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) | #2C3F65 | 0.033 |
| Deuteranopia (no green cones) | #2C3E62 | 0.033 |
| Tritanopia (no blue cones) | #384149 | 0.060 |
| Achromatopsia (no color) | #3F3F3F | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403963
#403963
oklch(37.2% 0.071 290.2)
- #43430F
#43430F
oklch(37.2% 0.071 109.4)
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 #403963, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.054
- Prussian Blue #1D3557 ΔE 0.059
- Dark Blue Grey #1F3B4D ΔE 0.065
- Charcoal #264653 ΔE 0.065
- Onyx #343A40 ΔE 0.067
- Twilight Blue #0A437A ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.069
- Charcoal Grey #3C4142 ΔE 0.070
Use #403963 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.