#403D83
Closest named color: Dark Slate Blue (#483D8B). oklch(40.2% 0.114 281.9), rgb(64, 61, 131).
Aa
White text reads best on this color (9.48:1).
About this color
#403D83 is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.114 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.019 away. White text reads best on it, at 9.48:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.114) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.21:1 |
| White text | 9.48:1 |
Values
| HEX | #403D83 |
| RGB | rgb(64, 61, 131) |
| HSL | hsl(243, 36%, 38%) |
| OKLCH | oklch(40.2% 0.114 281.9) |
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 #403D83 | 9.48:1 | AAA | Lc -96.0 | Preferred for body text |
| Black text on #403D83 | 2.21:1 | Fails | Lc 12.2 | Not readable |
| #403D83 text on white | 9.48:1 | AAA | Lc 91.7 | Preferred for body text |
| #403D83 text on black | 2.21:1 | Fails | Lc -10.6 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E7E8FB
oklch(93.6% 0.026 283.5)
-
Step 200
200
#D3D6F9
oklch(88.5% 0.048 281.5)
-
Step 300
300
#B7BAF7
oklch(80.8% 0.086 282.1)
-
Step 400
400
#9494F3
oklch(70.6% 0.137 282.3)
-
Step 500
500
#7B77EF
oklch(63.1% 0.175 281.6)
-
Step 600
600
#665CDD
oklch(55.5% 0.19 281.7)
-
Step 700
700
#564BC0
oklch(49.2% 0.176 282)
-
Step 800
800
#463E9B
oklch(42.7% 0.146 282.1)
-
Step 900
900 (this color)
#403D83
oklch(40.2% 0.114 281.9)
-
Step 950
950
#222048
oklch(26.9% 0.072 282.7)
#403D83 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) | #1A4885 | 0.050 |
| Deuteranopia (no green cones) | #154381 | 0.051 |
| Tritanopia (no blue cones) | #274C5A | 0.097 |
| Achromatopsia (no color) | #464646 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403D83
#403D83
oklch(40.2% 0.114 281.9)
- #514900
#514900
oklch(40.1% 0.084 102.3)
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 #403D83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.019
- Blueberry #464196 ΔE 0.034
- Cobalt #1E488F ΔE 0.049
- Twilight Blue #0A437A ΔE 0.060
- Twilight #4E518B ΔE 0.062
- Dusk Blue #26538D ΔE 0.064
- Light Navy #155084 ΔE 0.065
- Dusk #4E5481 ΔE 0.072
Use #403D83 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.