#40406E
Closest named color: Dark Slate Blue (#483D8B). oklch(39.4% 0.077 282.3), rgb(64, 64, 110).
Aa
White text reads best on this color (9.64:1).
About this color
#40406E is a dark, moderately saturated purple. In OKLCH its lightness is 39%, its chroma 0.077 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.053 away. White text reads best on it, at 9.64:1.
| Hue family | Purples |
| Lightness | dark (39%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.17:1 |
| White text | 9.64:1 |
Values
| HEX | #40406E |
| RGB | rgb(64, 64, 110) |
| HSL | hsl(240, 26%, 34%) |
| OKLCH | oklch(39.4% 0.077 282.3) |
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 #40406E | 9.64:1 | AAA | Lc -96.5 | Preferred for body text |
| Black text on #40406E | 2.17:1 | Fails | Lc 11.7 | Not readable |
| #40406E text on white | 9.64:1 | AAA | Lc 92.3 | Preferred for body text |
| #40406E text on black | 2.17:1 | Fails | Lc -10.1 | 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 900.
-
Step 50
50
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E8E9F5
oklch(93.7% 0.016 282.3)
-
Step 200
200
#D5D7EE
oklch(88.5% 0.032 281.8)
-
Step 300
300
#BABDE6
oklch(81% 0.058 281.7)
-
Step 400
400
#979AD9
oklch(70.8% 0.092 281.7)
-
Step 500
500
#7F7FCF
oklch(63.1% 0.119 282.4)
-
Step 600
600
#6967BC
oklch(55.6% 0.129 282.4)
-
Step 700
700
#5856A2
oklch(49.2% 0.119 282.3)
-
Step 800
800
#484683
oklch(42.7% 0.099 282.8)
-
Step 900
900 (this color)
#40406E
oklch(39.4% 0.077 282.3)
-
Step 950
950
#23233E
oklch(27% 0.05 282.6)
#40406E 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) | #304670 | 0.027 |
| Deuteranopia (no green cones) | #2E436D | 0.027 |
| Tritanopia (no blue cones) | #334951 | 0.067 |
| Achromatopsia (no color) | #454545 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40406E
#40406E
oklch(39.4% 0.077 282.3)
- #4E470A
#4E470A
oklch(39.3% 0.077 102.4)
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 #40406E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.053
- Twilight Blue #0A437A ΔE 0.058
- Light Navy #155084 ΔE 0.064
- Cobalt #1E488F ΔE 0.066
- Charcoal #264653 ΔE 0.066
- Dusk #4E5481 ΔE 0.067
- Blueberry #464196 ΔE 0.068
Use #40406E 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.