#40428D
Closest named color: Dark Slate Blue (#483D8B). oklch(41.9% 0.122 278.6), rgb(64, 66, 141).
Aa
White text reads best on this color (8.81:1).
About this color
#40428D is a dark, moderately saturated blue. In OKLCH its lightness is 42%, its chroma 0.122 and its hue 279°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.017 away. White text reads best on it, at 8.81:1.
| Hue family | Blues |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #40428D |
| RGB | rgb(64, 66, 141) |
| HSL | hsl(238, 38%, 40%) |
| OKLCH | oklch(41.9% 0.122 278.6) |
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 #40428D | 8.81:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #40428D | 2.38:1 | Fails | Lc 14.0 | Not readable |
| #40428D text on white | 8.81:1 | AAA | Lc 89.9 | Fine for body text |
| #40428D text on black | 2.38:1 | Fails | Lc -12.3 | 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 800.
-
Step 50
50
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E6E9F8
oklch(93.6% 0.02 276.9)
-
Step 200
200
#D3D7F4
oklch(88.5% 0.04 279.3)
-
Step 300
300
#B6BDEF
oklch(81% 0.071 278.5)
-
Step 400
400
#9199E7
oklch(70.8% 0.114 278.6)
-
Step 500
500
#777EDF
oklch(63.2% 0.144 278.3)
-
Step 600
600
#6165CD
oklch(55.7% 0.158 278.3)
-
Step 700
700
#5153B1
oklch(49.1% 0.146 278.6)
-
Step 800
800 (this color)
#40428D
oklch(41.9% 0.122 278.6)
-
Step 900
900
#373A73
oklch(37.6% 0.096 278.5)
-
Step 950
950
#202343
oklch(27.1% 0.059 277.6)
#40428D 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) | #1A4D90 | 0.047 |
| Deuteranopia (no green cones) | #10478B | 0.050 |
| Tritanopia (no blue cones) | #1D5361 | 0.106 |
| Achromatopsia (no color) | #4A4A4A | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40428D
#40428D
oklch(41.9% 0.122 278.6)
- #594D00
#594D00
oklch(41.9% 0.087 98.9)
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 #40428D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.017
- Blueberry #464196 ΔE 0.018
- Cobalt #1E488F ΔE 0.040
- Twilight #4E518B ΔE 0.050
- Dusk Blue #26538D ΔE 0.052
- Light Navy #155084 ΔE 0.059
- Dusk #4E5481 ΔE 0.064
- Twilight Blue #0A437A ΔE 0.065
Use #40428D 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.