#403D6D
Closest named color: Dark Slate Blue (#483D8B). oklch(38.7% 0.08 284.8), rgb(64, 61, 109).
Aa
White text reads best on this color (9.96:1).
About this color
#403D6D is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.080 and its hue 285°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.053 away. White text reads best on it, at 9.96:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.080) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.10:1 |
| White text | 9.96:1 |
Values
| HEX | #403D6D |
| RGB | rgb(64, 61, 109) |
| HSL | hsl(244, 28%, 33%) |
| OKLCH | oklch(38.7% 0.08 284.8) |
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 #403D6D | 9.96:1 | AAA | Lc -97.2 | Preferred for body text |
| Black text on #403D6D | 2.10:1 | Fails | Lc 10.9 | Not readable |
| #403D6D text on white | 9.96:1 | AAA | Lc 93.1 | Preferred for body text |
| #403D6D 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
#E8E8F5
oklch(93.5% 0.017 286.1)
-
Step 200
200
#D6D7EF
oklch(88.6% 0.033 283.8)
-
Step 300
300
#BCBCE7
oklch(81% 0.06 285)
-
Step 400
400
#9A98DB
oklch(70.7% 0.097 285)
-
Step 500
500
#827ED1
oklch(63.2% 0.123 284.5)
-
Step 600
600
#6C65BE
oklch(55.5% 0.135 284.7)
-
Step 700
700
#5B54A3
oklch(49.2% 0.123 284.9)
-
Step 800
800
#4A4584
oklch(42.7% 0.102 284.8)
-
Step 900
900 (this color)
#403D6D
oklch(38.7% 0.08 284.8)
-
Step 950
950
#24223E
oklch(26.9% 0.051 285.7)
#403D6D 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) | #2C446F | 0.033 |
| Deuteranopia (no green cones) | #2B416C | 0.031 |
| Tritanopia (no blue cones) | #33464F | 0.069 |
| Achromatopsia (no color) | #434343 | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403D6D
#403D6D
oklch(38.7% 0.08 284.8)
- #4B4603
#4B4603
oklch(38.7% 0.08 104.8)
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 #403D6D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.056
- Twilight Blue #0A437A ΔE 0.059
- Cobalt #1E488F ΔE 0.069
- Blueberry #464196 ΔE 0.069
- Charcoal #264653 ΔE 0.069
- Prussian Blue #1D3557 ΔE 0.070
- Light Navy #155084 ΔE 0.070
Use #403D6D 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.