#40396E
Closest named color: Dark Slate Blue (#483D8B). oklch(37.9% 0.088 287.5), rgb(64, 57, 110).
Aa
White text reads best on this color (10.35:1).
About this color
#40396E is a dark, moderately saturated purple. In OKLCH its lightness is 38%, its chroma 0.088 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.051 away. White text reads best on it, at 10.35:1.
| Hue family | Purples |
| Lightness | dark (38%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.02:1 |
| White text | 10.35:1 |
Values
| HEX | #40396E |
| RGB | rgb(64, 57, 110) |
| HSL | hsl(248, 32%, 33%) |
| OKLCH | oklch(37.9% 0.088 287.5) |
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 #40396E | 10.35:1 | AAA | Lc -97.9 | Preferred for body text |
| Black text on #40396E | 2.02:1 | Fails | Lc 10.0 | Not readable |
| #40396E text on white | 10.35:1 | AAA | Lc 93.9 | Preferred for body text |
| #40396E text on black | 2.02:1 | Fails | Lc -8.6 | 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
#F5F5FB
oklch(97.2% 0.008 286.3)
-
Step 100
100
#E9E8F6
oklch(93.6% 0.019 289.3)
-
Step 200
200
#D7D6F1
oklch(88.5% 0.037 287.3)
-
Step 300
300
#BDBBEA
oklch(81% 0.066 286.8)
-
Step 400
400
#9D96DF
oklch(70.7% 0.106 287.8)
-
Step 500
500
#867AD6
oklch(63% 0.136 287.8)
-
Step 600
600
#7062C4
oklch(55.7% 0.147 287.2)
-
Step 700
700
#5E50A9
oklch(49% 0.137 287.4)
-
Step 800
800
#4D4289
oklch(42.7% 0.114 287.7)
-
Step 900
900 (this color)
#40396E
oklch(37.9% 0.088 287.5)
-
Step 950
950
#252140
oklch(26.9% 0.057 287.9)
#40396E 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) | #254170 | 0.042 |
| Deuteranopia (no green cones) | #253F6D | 0.041 |
| Tritanopia (no blue cones) | #33444E | 0.075 |
| Achromatopsia (no color) | #404040 | 0.089 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40396E
#40396E
oklch(37.9% 0.088 287.5)
- #474500
#474500
oklch(38% 0.082 107.9)
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 #40396E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.051
- Twilight Blue #0A437A ΔE 0.062
- Dark Grey Blue #29465B ΔE 0.065
- Prussian Blue #1D3557 ΔE 0.068
- Blueberry #464196 ΔE 0.069
- Marine Blue #01386A ΔE 0.071
- Cobalt #1E488F ΔE 0.072
- Charcoal #264653 ΔE 0.078
Use #40396E 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.