#40678B
Closest named color: Denim (#3B638C). oklch(50.1% 0.073 247.6), rgb(64, 103, 139).
Aa
White text reads best on this color (5.94:1).
About this color
#40678B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.073 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.014 away. White text reads best on it, at 5.94:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.073) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.53:1 |
| White text | 5.94:1 |
Values
| HEX | #40678B |
| RGB | rgb(64, 103, 139) |
| HSL | hsl(209, 37%, 40%) |
| OKLCH | oklch(50.1% 0.073 247.6) |
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 #40678B | 5.94:1 | AA | Lc -84.8 | Fine for body text |
| Black text on #40678B | 3.53:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #40678B text on white | 5.94:1 | AA | Lc 79.6 | Fine for body text |
| #40678B text on black | 3.53:1 | AA large text | Lc -22.2 | 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
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#CFDBE6
oklch(88.6% 0.02 245.7)
-
Step 300
300
#AFC3D7
oklch(80.8% 0.036 248.3)
-
Step 400
400
#85A4C3
oklch(70.6% 0.057 248.6)
-
Step 500
500
#668EB3
oklch(63.2% 0.071 247.1)
-
Step 600
600
#4C779F
oklch(55.5% 0.079 247.7)
-
Step 700
700 (this color)
#40678B
oklch(50.1% 0.073 247.6)
-
Step 800
800
#33526F
oklch(42.8% 0.061 247.8)
-
Step 900
900
#2D4459
oklch(37.7% 0.046 246.9)
-
Step 950
950
#1B2834
oklch(27.1% 0.029 246.9)
#40678B 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) | #58688D | 0.031 |
| Deuteranopia (no green cones) | #4E608A | 0.025 |
| Tritanopia (no blue cones) | #166F73 | 0.062 |
| Achromatopsia (no color) | #646464 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40678B
#40678B
oklch(50.1% 0.073 247.6)
- #7F5B33
#7F5B33
oklch(50% 0.073 67.7)
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 #40678B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.014
- Dusky Blue #475F94 ΔE 0.031
- Muted Blue #3B719F ΔE 0.038
- Peacock Blue #016795 ΔE 0.040
- Denim Blue #3B5B92 ΔE 0.041
- Metallic Blue #4F738E ΔE 0.042
- Slate #516572 ΔE 0.042
- Ocean Blue #03719C ΔE 0.044
Use #40678B 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.