#40317D
Closest named color: Dark Slate Blue (#483D8B). oklch(37.4% 0.123 288), rgb(64, 49, 125).
Aa
White text reads best on this color (10.75:1).
About this color
#40317D is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.123 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.041 away. White text reads best on it, at 10.75:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.95:1 |
| White text | 10.75:1 |
Values
| HEX | #40317D |
| RGB | rgb(64, 49, 125) |
| HSL | hsl(252, 44%, 34%) |
| OKLCH | oklch(37.4% 0.123 288) |
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 #40317D | 10.75:1 | AAA | Lc -98.5 | Preferred for body text |
| Black text on #40317D | 1.95:1 | Fails | Lc 9.3 | Not readable |
| #40317D text on white | 10.75:1 | AAA | Lc 94.6 | Preferred for body text |
| #40317D text on black | 1.95:1 | Fails | Lc -8.0 | 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
#F5F4FE
oklch(97.1% 0.013 290.8)
-
Step 100
100
#E8E7FB
oklch(93.5% 0.027 288.2)
-
Step 200
200
#D7D4FA
oklch(88.4% 0.052 288.9)
-
Step 300
300
#BDB8FA
oklch(81% 0.093 287.6)
-
Step 400
400
#9D90F7
oklch(70.8% 0.148 287.8)
-
Step 500
500
#8770F3
oklch(63.1% 0.189 287.8)
-
Step 600
600
#7353E2
oklch(55.6% 0.207 288)
-
Step 700
700
#6143C4
oklch(49.2% 0.191 288)
-
Step 800
800
#4F389F
oklch(42.8% 0.159 288)
-
Step 900
900 (this color)
#40317D
oklch(37.4% 0.123 288)
-
Step 950
950
#261E4A
oklch(27.1% 0.079 288.4)
#40317D 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) | #003F80 | 0.070 |
| Deuteranopia (no green cones) | #003C7B | 0.070 |
| Tritanopia (no blue cones) | #2C4252 | 0.101 |
| Achromatopsia (no color) | #3E3E3E | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40317D
#40317D
oklch(37.4% 0.123 288)
- #454300
#454300
oklch(37.3% 0.08 107.8)
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 #40317D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.041
- Blueberry #464196 ΔE 0.057
- Twilight Blue #0A437A ΔE 0.072
- Cobalt #1E488F ΔE 0.072
- Indigo #4B0082 ΔE 0.075
- Marine Blue #01386A ΔE 0.080
- Rebecca Purple #663399 ΔE 0.085
- Royal Purple #4B006E ΔE 0.085
Use #40317D 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.