#40407A
Closest named color: Dark Slate Blue (#483D8B). oklch(40.1% 0.096 281.2), rgb(64, 64, 122).
Aa
White text reads best on this color (9.40:1).
About this color
#40407A is a dark, moderately saturated purple. In OKLCH its lightness is 40%, its chroma 0.096 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.033 away. White text reads best on it, at 9.40:1.
| Hue family | Purples |
| Lightness | dark (40%) |
| Chroma | moderately saturated (0.096) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.23:1 |
| White text | 9.40:1 |
Values
| HEX | #40407A |
| RGB | rgb(64, 64, 122) |
| HSL | hsl(240, 31%, 36%) |
| OKLCH | oklch(40.1% 0.096 281.2) |
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 #40407A | 9.40:1 | AAA | Lc -95.9 | Preferred for body text |
| Black text on #40407A | 2.23:1 | Fails | Lc 12.3 | Not readable |
| #40407A text on white | 9.40:1 | AAA | Lc 91.6 | Preferred for body text |
| #40407A text on black | 2.23:1 | Fails | Lc -10.8 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F8
oklch(93.7% 0.02 279.9)
-
Step 200
200
#D4D7F4
oklch(88.6% 0.04 280.9)
-
Step 300
300
#B8BCEF
oklch(81% 0.072 281.2)
-
Step 400
400
#9498E7
oklch(70.8% 0.115 280.8)
-
Step 500
500
#7C7CDF
oklch(63.1% 0.146 281.4)
-
Step 600
600
#6663CD
oklch(55.6% 0.159 281.2)
-
Step 700
700
#5551B1
oklch(49% 0.148 281.3)
-
Step 800
800
#454390
oklch(42.7% 0.124 281)
-
Step 900
900 (this color)
#40407A
oklch(40.1% 0.096 281.2)
-
Step 950
950
#222243
oklch(27% 0.06 281.6)
#40407A 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) | #29487C | 0.035 |
| Deuteranopia (no green cones) | #254479 | 0.036 |
| Tritanopia (no blue cones) | #2C4C57 | 0.083 |
| Achromatopsia (no color) | #464646 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40407A
#40407A
oklch(40.1% 0.096 281.2)
- #524900
#524900
oklch(40.2% 0.084 101.3)
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 #40407A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.033
- Blueberry #464196 ΔE 0.048
- Cobalt #1E488F ΔE 0.052
- Twilight Blue #0A437A ΔE 0.056
- Twilight #4E518B ΔE 0.058
- Light Navy #155084 ΔE 0.059
- Dusk Blue #26538D ΔE 0.061
- Dusk #4E5481 ΔE 0.063
Use #40407A 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.