#40439D
Closest named color: Blueberry (#464196). oklch(43.3% 0.143 277.1), rgb(64, 67, 157).
Aa
White text reads best on this color (8.37:1).
About this color
#40439D is a dark, vivid blue. In OKLCH its lightness is 43%, its chroma 0.143 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Blueberry (#464196), ΔE 0.015 away. White text reads best on it, at 8.37:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | vivid (0.143) |
| Temperature | cool |
| Nearest name | Blueberry (#464196) |
| Black text | 2.50:1 |
| White text | 8.37:1 |
Values
| HEX | #40439D |
| RGB | rgb(64, 67, 157) |
| HSL | hsl(238, 42%, 43%) |
| OKLCH | oklch(43.3% 0.143 277.1) |
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 #40439D | 8.37:1 | AAA | Lc -93.2 | Preferred for body text |
| Black text on #40439D | 2.50:1 | Fails | Lc 15.4 | Dividers and decoration only |
| #40439D text on white | 8.37:1 | AAA | Lc 88.5 | Fine for body text |
| #40439D text on black | 2.50:1 | Fails | Lc -13.6 | 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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E5E9FB
oklch(93.6% 0.025 275.9)
-
Step 200
200
#D1D7F8
oklch(88.5% 0.046 277.3)
-
Step 300
300
#B3BCF7
oklch(80.9% 0.084 277.6)
-
Step 400
400
#8C97F3
oklch(70.6% 0.135 277.2)
-
Step 500
500
#727BEE
oklch(63.2% 0.17 277)
-
Step 600
600
#5C60DD
oklch(55.5% 0.187 277)
-
Step 700
700
#4D4FC0
oklch(49.2% 0.173 277.2)
-
Step 800
800 (this color)
#40439D
oklch(43.3% 0.143 277.1)
-
Step 900
900
#35387B
oklch(37.6% 0.112 277.7)
-
Step 950
950
#1F2248
oklch(27.1% 0.07 277.3)
#40439D 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) | #0052A0 | 0.057 |
| Deuteranopia (no green cones) | #004A9B | 0.053 |
| Tritanopia (no blue cones) | #005869 | 0.125 |
| Achromatopsia (no color) | #4E4E4E | 0.144 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40439D
#40439D
oklch(43.3% 0.143 277.1)
- #5E5000
#5E5000
oklch(43.2% 0.089 97.5)
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 #40439D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Blueberry #464196 ΔE 0.015
- Dark Slate Blue #483D8B ΔE 0.033
- Cobalt #1E488F ΔE 0.047
- Sapphire #2138AB ΔE 0.055
- Twilight #4E518B ΔE 0.057
- Dusk Blue #26538D ΔE 0.059
- Denim Blue #3B5B92 ΔE 0.070
- Light Navy #155084 ΔE 0.071
Use #40439D 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.