#40688E
Closest named color: Denim (#3B638C). oklch(50.4% 0.076 248.4), rgb(64, 104, 142).
Aa
White text reads best on this color (5.85:1).
About this color
#40688E is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.076 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 5.85:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Denim (#3B638C) |
| Black text | 3.58:1 |
| White text | 5.85:1 |
Values
| HEX | #40688E |
| RGB | rgb(64, 104, 142) |
| HSL | hsl(209, 38%, 40%) |
| OKLCH | oklch(50.4% 0.076 248.4) |
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 #40688E | 5.85:1 | AA | Lc -84.4 | Fine for body text |
| Black text on #40688E | 3.58:1 | AA large text | Lc 24.9 | Dividers and decoration only |
| #40688E text on white | 5.85:1 | AA | Lc 79.2 | Fine for body text |
| #40688E text on black | 3.58:1 | AA large text | Lc -22.7 | 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
#AFC3D8
oklch(80.9% 0.037 249.6)
-
Step 400
400
#84A4C4
oklch(70.6% 0.059 248.7)
-
Step 500
500
#658EB5
oklch(63.2% 0.074 247.8)
-
Step 600
600
#4B77A1
oklch(55.5% 0.082 248.4)
-
Step 700
700 (this color)
#40688E
oklch(50.4% 0.076 248.4)
-
Step 800
800
#325270
oklch(42.8% 0.063 248)
-
Step 900
900
#2C445B
oklch(37.8% 0.05 248.2)
-
Step 950
950
#1A2835
oklch(27% 0.031 247.2)
#40688E 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) | #586990 | 0.030 |
| Deuteranopia (no green cones) | #4E618D | 0.024 |
| Tritanopia (no blue cones) | #107175 | 0.065 |
| Achromatopsia (no color) | #656565 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40688E
#40688E
oklch(50.4% 0.076 248.4)
- #815C32
#815C32
oklch(50.4% 0.076 68.1)
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 #40688E, 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 0.031
- Muted Blue #3B719F ΔE 0.033
- Metallic Blue #4F738E ΔE 0.039
- Peacock Blue #016795 ΔE 0.039
- Ocean Blue #03719C ΔE 0.041
- Denim Blue #3B5B92 ΔE 0.042
- Dull Blue #49759C ΔE 0.043
Use #40688E 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.