#403E90
Closest named color: Dark Slate Blue (#483D8B). oklch(41.3% 0.132 280), rgb(64, 62, 144).
Aa
White text reads best on this color (9.09:1).
About this color
#403E90 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.132 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.015 away. White text reads best on it, at 9.09:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.132) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.30:1 |
| White text | 9.09:1 |
Values
| HEX | #403E90 |
| RGB | rgb(64, 62, 144) |
| HSL | hsl(241, 40%, 40%) |
| OKLCH | oklch(41.3% 0.132 280) |
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 #403E90 | 9.09:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #403E90 | 2.30:1 | Fails | Lc 13.3 | Not readable |
| #403E90 text on white | 9.09:1 | AAA | Lc 90.6 | Preferred for body text |
| #403E90 text on black | 2.30:1 | Fails | Lc -11.7 | 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
#E6E9F9
oklch(93.6% 0.022 277.5)
-
Step 200
200
#D3D7F6
oklch(88.6% 0.043 279.7)
-
Step 300
300
#B6BCF2
oklch(80.9% 0.076 279.6)
-
Step 400
400
#9297EC
oklch(70.7% 0.124 280.2)
-
Step 500
500
#797BE6
oklch(63.2% 0.158 280.1)
-
Step 600
600
#6361D4
oklch(55.5% 0.172 280)
-
Step 700
700
#5350B7
oklch(49.1% 0.158 280.1)
-
Step 800
800 (this color)
#403E90
oklch(41.3% 0.132 280)
-
Step 900
900
#383976
oklch(37.7% 0.102 279.6)
-
Step 950
950
#212245
oklch(27.1% 0.064 280)
#403E90 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) | #054C93 | 0.059 |
| Deuteranopia (no green cones) | #00458E | 0.058 |
| Tritanopia (no blue cones) | #1B5161 | 0.113 |
| Achromatopsia (no color) | #484848 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #403E90
#403E90
oklch(41.3% 0.132 280)
- #564C00
#564C00
oklch(41.4% 0.086 100.7)
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 #403E90, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.015
- Blueberry #464196 ΔE 0.016
- Cobalt #1E488F ΔE 0.045
- Twilight #4E518B ΔE 0.060
- Dusk Blue #26538D ΔE 0.062
- Sapphire #2138AB ΔE 0.063
- Light Navy #155084 ΔE 0.068
- Twilight Blue #0A437A ΔE 0.069
Use #403E90 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.