#40368A
Closest named color: Dark Slate Blue (#483D8B). oklch(39.4% 0.134 283.7), rgb(64, 54, 138).
Aa
White text reads best on this color (9.94:1).
About this color
#40368A is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.134 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 9.94:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.134) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.11:1 |
| White text | 9.94:1 |
Values
| HEX | #40368A |
| RGB | rgb(64, 54, 138) |
| HSL | hsl(247, 44%, 38%) |
| OKLCH | oklch(39.4% 0.134 283.7) |
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 #40368A | 9.94:1 | AAA | Lc -96.9 | Preferred for body text |
| Black text on #40368A | 2.11:1 | Fails | Lc 11.2 | Not readable |
| #40368A text on white | 9.94:1 | AAA | Lc 92.7 | Preferred for body text |
| #40368A text on black | 2.11:1 | Fails | Lc -9.7 | 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 900.
-
Step 50
50
#F4F4FF
oklch(97% 0.015 286.1)
-
Step 100
100
#E7E8FD
oklch(93.7% 0.028 283.7)
-
Step 200
200
#D4D5FE
oklch(88.5% 0.056 284.1)
-
Step 300
300
#B8B8FF
oklch(80.8% 0.1 283.9)
-
Step 400
400
#9690FF
oklch(70.7% 0.159 284)
-
Step 500
500
#7F6FFF
oklch(63.1% 0.206 283.8)
-
Step 600
600
#6B51EE
oklch(55.5% 0.224 283.9)
-
Step 700
700
#5A40CF
oklch(49.1% 0.208 284)
-
Step 800
800
#4936A8
oklch(42.7% 0.174 283.9)
-
Step 900
900 (this color)
#40368A
oklch(39.4% 0.134 283.7)
-
Step 950
950
#231E4E
oklch(27.1% 0.085 283.9)
#40368A 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) | #00458D | 0.065 |
| Deuteranopia (no green cones) | #004088 | 0.064 |
| Tritanopia (no blue cones) | #224A5A | 0.115 |
| Achromatopsia (no color) | #434343 | 0.135 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40368A
#40368A
oklch(39.4% 0.134 283.7)
- #4E4700
#4E4700
oklch(39.3% 0.083 103.1)
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 #40368A, 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 0.035
- Cobalt #1E488F ΔE 0.057
- Sapphire #2138AB ΔE 0.068
- Twilight Blue #0A437A ΔE 0.071
- Rebecca Purple #663399 ΔE 0.073
- Imperial Purple #480CA8 ΔE 0.077
- Twilight #4E518B ΔE 0.078
Use #40368A 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.