#40307F
Closest named color: Dark Slate Blue (#483D8B). oklch(37.4% 0.128 287.9), rgb(64, 48, 127).
Aa
White text reads best on this color (10.78:1).
About this color
#40307F is a dark, moderately saturated purple. In OKLCH its lightness is 37%, its chroma 0.128 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 10.78:1.
| Hue family | Purples |
| Lightness | dark (37%) |
| Chroma | moderately saturated (0.128) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 1.94:1 |
| White text | 10.78:1 |
Values
| HEX | #40307F |
| RGB | rgb(64, 48, 127) |
| HSL | hsl(252, 45%, 34%) |
| OKLCH | oklch(37.4% 0.128 287.9) |
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 #40307F | 10.78:1 | AAA | Lc -98.6 | Preferred for body text |
| Black text on #40307F | 1.94:1 | Fails | Lc 9.3 | Not readable |
| #40307F text on white | 10.78:1 | AAA | Lc 94.6 | Preferred for body text |
| #40307F text on black | 1.94:1 | 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
#E8E7FC
oklch(93.5% 0.028 288)
-
Step 200
200
#D7D4FB
oklch(88.5% 0.053 288.8)
-
Step 300
300
#BDB7FB
oklch(80.9% 0.095 288.1)
-
Step 400
400
#9D8FFA
oklch(70.8% 0.153 287.8)
-
Step 500
500
#876EF7
oklch(63% 0.197 287.8)
-
Step 600
600
#7351E6
oklch(55.6% 0.214 287.8)
-
Step 700
700
#6140C7
oklch(49% 0.198 288)
-
Step 800
800
#4F36A1
oklch(42.6% 0.164 288.1)
-
Step 900
900 (this color)
#40307F
oklch(37.4% 0.128 287.9)
-
Step 950
950
#261E4B
oklch(27.1% 0.08 288)
#40307F 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) | #003F82 | 0.071 |
| Deuteranopia (no green cones) | #003B7D | 0.070 |
| Tritanopia (no blue cones) | #2B4252 | 0.106 |
| Achromatopsia (no color) | #3D3D3D | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40307F
#40307F
oklch(37.4% 0.128 287.9)
- #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 #40307F, 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
- Indigo #4B0082 ΔE 0.072
- Cobalt #1E488F ΔE 0.073
- Twilight Blue #0A437A ΔE 0.074
- Marine Blue #01386A ΔE 0.082
- Imperial Purple #480CA8 ΔE 0.082
- Rebecca Purple #663399 ΔE 0.083
Use #40307F 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.