#403D8A
Closest named color: Dark Slate Blue (#483D8B). oklch(40.7% 0.124 281.1), rgb(64, 61, 138).
Aa
White text reads best on this color (9.32:1).
About this color
#403D8A is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.124 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.013 away. White text reads best on it, at 9.32:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.124) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.25:1 |
| White text | 9.32:1 |
Values
| HEX | #403D8A |
| RGB | rgb(64, 61, 138) |
| HSL | hsl(242, 39%, 39%) |
| OKLCH | oklch(40.7% 0.124 281.1) |
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 #403D8A | 9.32:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #403D8A | 2.25:1 | Fails | Lc 12.7 | Not readable |
| #403D8A text on white | 9.32:1 | AAA | Lc 91.3 | Preferred for body text |
| #403D8A text on black | 2.25:1 | Fails | Lc -11.1 | 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 800.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D4D7F4
oklch(88.6% 0.04 280.9)
-
Step 300
300
#B8BCEF
oklch(81% 0.072 281.2)
-
Step 400
400
#9497E7
oklch(70.6% 0.116 281.3)
-
Step 500
500
#7B7CE0
oklch(63.1% 0.148 280.9)
-
Step 600
600
#6662CE
oklch(55.5% 0.162 281.4)
-
Step 700
700
#5551B2
oklch(49.1% 0.15 281.2)
-
Step 800
800 (this color)
#403D8A
oklch(40.7% 0.124 281.1)
-
Step 900
900
#3A3973
oklch(37.7% 0.097 281.5)
-
Step 950
950
#222243
oklch(27% 0.06 281.6)
#403D8A 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) | #0F4A8D | 0.056 |
| Deuteranopia (no green cones) | #034488 | 0.058 |
| Tritanopia (no blue cones) | #214E5D | 0.107 |
| Achromatopsia (no color) | #474747 | 0.125 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403D8A
#403D8A
oklch(40.7% 0.124 281.1)
- #544A00
#544A00
oklch(40.7% 0.085 100.5)
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 #403D8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.013
- Blueberry #464196 ΔE 0.024
- Cobalt #1E488F ΔE 0.046
- Twilight #4E518B ΔE 0.061
- Dusk Blue #26538D ΔE 0.063
- Twilight Blue #0A437A ΔE 0.064
- Light Navy #155084 ΔE 0.067
- Sapphire #2138AB ΔE 0.069
Use #403D8A 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.