#40517A
Closest named color: Dusk (#4E5481). oklch(43.9% 0.071 266.3), rgb(64, 81, 122).
Aa
White text reads best on this color (7.84:1).
About this color
#40517A is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.071 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.025 away. White text reads best on it, at 7.84:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.67:1 |
| White text | 7.84:1 |
Values
| HEX | #40517A |
| RGB | rgb(64, 81, 122) |
| HSL | hsl(222, 31%, 36%) |
| OKLCH | oklch(43.9% 0.071 266.3) |
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 #40517A | 7.84:1 | AAA | Lc -91.9 | Preferred for body text |
| Black text on #40517A | 2.67:1 | Fails | Lc 16.8 | Dividers and decoration only |
| #40517A text on white | 7.84:1 | AAA | Lc 87.2 | Fine for body text |
| #40517A text on black | 2.67:1 | Fails | Lc -14.9 | Not readable |
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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E9
oklch(88.5% 0.023 266.9)
-
Step 300
300
#B4C1DC
oklch(81% 0.041 265)
-
Step 400
400
#8DA0CB
oklch(70.7% 0.067 266.1)
-
Step 500
500
#7288BE
oklch(63.1% 0.086 266.9)
-
Step 600
600
#5A71AA
oklch(55.5% 0.093 266.7)
-
Step 700
700
#4A5F92
oklch(49.2% 0.086 266.3)
-
Step 800
800 (this color)
#40517A
oklch(43.9% 0.071 266.3)
-
Step 900
900
#34415F
oklch(37.8% 0.054 265.9)
-
Step 950
950
#1E2638
oklch(27% 0.036 265.6)
#40517A 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) | #42557C | 0.012 |
| Deuteranopia (no green cones) | #3C4F79 | 0.009 |
| Tritanopia (no blue cones) | #2A5A60 | 0.064 |
| Achromatopsia (no color) | #525252 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40517A
#40517A
oklch(43.9% 0.071 266.3)
- #644F1F
#644F1F
oklch(43.9% 0.071 85.3)
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 #40517A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.025
- YInMn Blue #415A77 ΔE 0.029
- Light Navy Blue #2E5A88 ΔE 0.034
- Twilight #4E518B ΔE 0.036
- Dusty Grape #545775 ΔE 0.038
- Dusk Blue #26538D ΔE 0.040
- Denim Blue #3B5B92 ΔE 0.043
- Light Navy #155084 ΔE 0.045
Use #40517A 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.