#40639D
Closest named color: Dusky Blue (#475F94). oklch(50.1% 0.102 260), rgb(64, 99, 157).
Aa
White text reads best on this color (6.01:1).
About this color
#40639D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.102 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.017 away. White text reads best on it, at 6.01:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.102) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.48:1 |
| White text | 6.01:1 |
Values
| HEX | #40639D |
| RGB | rgb(64, 99, 157) |
| HSL | hsl(217, 42%, 43%) |
| OKLCH | oklch(50.1% 0.102 260) |
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 #40639D | 6.01:1 | AA | Lc -85.1 | Fine for body text |
| Black text on #40639D | 3.48:1 | AA large text | Lc 24.1 | Dividers and decoration only |
| #40639D text on white | 6.01:1 | AA | Lc 79.9 | Fine for body text |
| #40639D text on black | 3.48:1 | AA large text | Lc -21.9 | Dividers and decoration only |
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 700.
-
Step 50
50
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF4
oklch(93.5% 0.015 260.7)
-
Step 200
200
#CFDAEC
oklch(88.5% 0.028 260.3)
-
Step 300
300
#AEC2E1
oklch(80.9% 0.049 259.1)
-
Step 400
400
#84A2D2
oklch(70.8% 0.078 259.7)
-
Step 500
500
#658AC6
oklch(63.1% 0.1 259.8)
-
Step 600
600
#4C73B3
oklch(55.6% 0.109 259.9)
-
Step 700
700 (this color)
#40639D
oklch(50.1% 0.102 260)
-
Step 800
800
#334F7D
oklch(42.8% 0.084 259.9)
-
Step 900
900
#2D4264
oklch(37.8% 0.064 259.7)
-
Step 950
950
#1A273B
oklch(27.1% 0.042 258.8)
#40639D 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) | #4B689F | 0.021 |
| Deuteranopia (no green cones) | #3F5F9C | 0.012 |
| Tritanopia (no blue cones) | #007078 | 0.090 |
| Achromatopsia (no color) | #636363 | 0.102 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40639D
#40639D
oklch(50.1% 0.102 260)
- #815C06
#815C06
oklch(50.1% 0.101 80.6)
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 #40639D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.017
- Denim Blue #3B5B92 ΔE 0.028
- Denim #3B638C ΔE 0.029
- French Blue #436BAD ΔE 0.032
- Mid Blue #276AB3 ΔE 0.039
- Muted Blue #3B719F ΔE 0.040
- Peacock Blue #016795 ΔE 0.043
- Flat Blue #3C73A8 ΔE 0.045
Use #40639D 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.