#40688D
Closest named color: Denim (#3B638C). oklch(50.4% 0.075 247.7), rgb(64, 104, 141).
Aa
White text reads best on this color (5.86:1).
About this color
#40688D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.075 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Denim (#3B638C), ΔE 0.017 away. White text reads best on it, at 5.86:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.58:1 |
| White text | 5.86:1 |
Values
| HEX | #40688D |
| RGB | rgb(64, 104, 141) |
| HSL | hsl(209, 38%, 40%) |
| OKLCH | oklch(50.4% 0.075 247.7) |
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 #40688D | 5.86:1 | AA | Lc -84.4 | Fine for body text |
| Black text on #40688D | 3.58:1 | AA large text | Lc 24.9 | Dividers and decoration only |
| #40688D text on white | 5.86:1 | AA | Lc 79.2 | Fine for body text |
| #40688D text on black | 3.58:1 | AA large text | Lc -22.6 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EBF1
oklch(93.7% 0.01 247.9)
-
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
#84A4C3
oklch(70.6% 0.058 247.8)
-
Step 500
500
#658EB4
oklch(63.2% 0.073 247.2)
-
Step 600
600
#4B77A0
oklch(55.5% 0.081 247.8)
-
Step 700
700 (this color)
#40688D
oklch(50.4% 0.075 247.7)
-
Step 800
800
#32526F
oklch(42.7% 0.061 247.1)
-
Step 900
900
#2C445A
oklch(37.7% 0.048 247.1)
-
Step 950
950
#1A2835
oklch(27% 0.031 247.2)
#40688D 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) | #59698F | 0.032 |
| Deuteranopia (no green cones) | #4F618C | 0.025 |
| Tritanopia (no blue cones) | #127175 | 0.064 |
| Achromatopsia (no color) | #656565 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40688D
#40688D
oklch(50.4% 0.075 247.7)
- #815C33
#815C33
oklch(50.5% 0.075 67.6)
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 #40688D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim #3B638C ΔE 0.017
- Dusky Blue #475F94 ΔE 0.032
- Muted Blue #3B719F ΔE 0.034
- Metallic Blue #4F738E ΔE 0.039
- Peacock Blue #016795 ΔE 0.040
- Ocean Blue #03719C ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.043
- Dull Blue #49759C ΔE 0.043
Use #40688D 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.