#40517E
Closest named color: Dusk (#4E5481). oklch(44.2% 0.077 267.5), rgb(64, 81, 126).
Aa
White text reads best on this color (7.78:1).
About this color
#40517E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.077 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.023 away. White text reads best on it, at 7.78:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.69:1 |
| White text | 7.78:1 |
Values
| HEX | #40517E |
| RGB | rgb(64, 81, 126) |
| HSL | hsl(224, 33%, 37%) |
| OKLCH | oklch(44.2% 0.077 267.5) |
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 #40517E | 7.78:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #40517E | 2.69:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #40517E text on white | 7.78:1 | AAA | Lc 87.0 | Fine for body text |
| #40517E text on black | 2.69:1 | Fails | Lc -15.1 | 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 800.
-
Step 50
50
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EA
oklch(88.5% 0.025 267.9)
-
Step 300
300
#B4C0DF
oklch(80.9% 0.046 268.6)
-
Step 400
400
#8DA0CF
oklch(70.8% 0.072 267.5)
-
Step 500
500
#7187C2
oklch(63% 0.093 268)
-
Step 600
600
#5970AE
oklch(55.5% 0.101 267.6)
-
Step 700
700
#495E96
oklch(49.1% 0.094 267.3)
-
Step 800
800 (this color)
#40517E
oklch(44.2% 0.077 267.5)
-
Step 900
900
#334062
oklch(37.6% 0.061 267.5)
-
Step 950
950
#1E2639
oklch(27% 0.037 266.4)
#40517E 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) | #405580 | 0.012 |
| Deuteranopia (no green cones) | #3A507D | 0.009 |
| Tritanopia (no blue cones) | #285A61 | 0.069 |
| Achromatopsia (no color) | #525252 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40517E
#40517E
oklch(44.2% 0.077 267.5)
- #655018
#655018
oklch(44.2% 0.077 87.7)
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 #40517E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.023
- Twilight #4E518B ΔE 0.030
- Light Navy Blue #2E5A88 ΔE 0.031
- YInMn Blue #415A77 ΔE 0.033
- Dusk Blue #26538D ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.039
- Dusty Grape #545775 ΔE 0.040
- Light Navy #155084 ΔE 0.043
Use #40517E 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.