#403D6C
Closest named color: Dark Slate Blue (#483D8B). oklch(38.6% 0.079 285), rgb(64, 61, 108).
Aa
White text reads best on this color (9.99:1).
About this color
#403D6C is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.079 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.054 away. White text reads best on it, at 9.99:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.10:1 |
| White text | 9.99:1 |
Values
| HEX | #403D6C |
| RGB | rgb(64, 61, 108) |
| HSL | hsl(244, 28%, 33%) |
| OKLCH | oklch(38.6% 0.079 285) |
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 #403D6C | 9.99:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #403D6C | 2.10:1 | Fails | Lc 10.8 | Not readable |
| #403D6C text on white | 9.99:1 | AAA | Lc 93.1 | Preferred for body text |
| #403D6C text on black | 2.10:1 | Fails | Lc -9.4 | 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
#E8E9F5
oklch(93.7% 0.016 282.3)
-
Step 200
200
#D6D7EF
oklch(88.6% 0.033 283.8)
-
Step 300
300
#BCBCE6
oklch(80.9% 0.059 285)
-
Step 400
400
#9A98D9
oklch(70.6% 0.094 285.1)
-
Step 500
500
#827ECF
oklch(63.1% 0.12 284.7)
-
Step 600
600
#6D66BC
oklch(55.7% 0.13 285)
-
Step 700
700
#5B54A2
oklch(49.1% 0.122 285.1)
-
Step 800
800
#4A4583
oklch(42.6% 0.1 285)
-
Step 900
900 (this color)
#403D6C
oklch(38.6% 0.079 285)
-
Step 950
950
#24233E
oklch(27.1% 0.05 284.3)
#403D6C 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) | #2D446E | 0.032 |
| Deuteranopia (no green cones) | #2C416B | 0.030 |
| Tritanopia (no blue cones) | #34464F | 0.067 |
| Achromatopsia (no color) | #424242 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403D6C
#403D6C
oklch(38.6% 0.079 285)
- #4A4606
#4A4606
oklch(38.6% 0.079 105.6)
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 #403D6C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.055
- Twilight Blue #0A437A ΔE 0.060
- Charcoal #264653 ΔE 0.068
- Prussian Blue #1D3557 ΔE 0.069
- Cobalt #1E488F ΔE 0.070
- Blueberry #464196 ΔE 0.071
- Light Navy #155084 ΔE 0.071
Use #403D6C 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.