#40368B
Closest named color: Dark Slate Blue (#483D8B). oklch(39.4% 0.136 283.6), rgb(64, 54, 139).
Aa
White text reads best on this color (9.91:1).
About this color
#40368B is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.136 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.024 away. White text reads best on it, at 9.91:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.136) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.11:1 |
| White text | 9.91:1 |
Values
| HEX | #40368B |
| RGB | rgb(64, 54, 139) |
| HSL | hsl(247, 44%, 38%) |
| OKLCH | oklch(39.4% 0.136 283.6) |
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 #40368B | 9.91:1 | AAA | Lc -96.8 | Preferred for body text |
| Black text on #40368B | 2.11:1 | Fails | Lc 11.3 | Not readable |
| #40368B text on white | 9.91:1 | AAA | Lc 92.6 | Preferred for body text |
| #40368B text on black | 2.11:1 | Fails | Lc -9.8 | 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
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E7E8FE
oklch(93.7% 0.03 283.7)
-
Step 200
200
#D3D5FE
oklch(88.5% 0.056 283)
-
Step 300
300
#B8B8FF
oklch(80.8% 0.1 283.9)
-
Step 400
400
#9590FF
oklch(70.6% 0.159 283.6)
-
Step 500
500
#7E6FFF
oklch(63% 0.206 283.5)
-
Step 600
600
#6A51F0
oklch(55.6% 0.227 283.4)
-
Step 700
700
#5940D1
oklch(49.1% 0.211 283.3)
-
Step 800
800
#4936A9
oklch(42.8% 0.175 283.7)
-
Step 900
900 (this color)
#40368B
oklch(39.4% 0.136 283.6)
-
Step 950
950
#231E4E
oklch(27.1% 0.085 283.9)
#40368B 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) | #00468E | 0.066 |
| Deuteranopia (no green cones) | #004089 | 0.064 |
| Tritanopia (no blue cones) | #214A5B | 0.115 |
| Achromatopsia (no color) | #434343 | 0.136 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40368B
#40368B
oklch(39.4% 0.136 283.6)
- #4E4800
#4E4800
oklch(39.5% 0.083 104.1)
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 #40368B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.024
- Blueberry #464196 ΔE 0.034
- Cobalt #1E488F ΔE 0.057
- Sapphire #2138AB ΔE 0.066
- Twilight Blue #0A437A ΔE 0.071
- Rebecca Purple #663399 ΔE 0.073
- Imperial Purple #480CA8 ΔE 0.076
- Twilight #4E518B ΔE 0.078
Use #40368B 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.