#40507E
Closest named color: Dusk (#4E5481). oklch(43.9% 0.079 268.5), rgb(64, 80, 126).
Aa
White text reads best on this color (7.87:1).
About this color
#40507E is a dark, moderately saturated blue. In OKLCH its lightness is 44%, its chroma 0.079 and its hue 268°. 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 7.87:1.
| Hue family | Blues |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.079) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.66:1 |
| White text | 7.87:1 |
Values
| HEX | #40507E |
| RGB | rgb(64, 80, 126) |
| HSL | hsl(225, 33%, 37%) |
| OKLCH | oklch(43.9% 0.079 268.5) |
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 #40507E | 7.87:1 | AAA | Lc -92.0 | Preferred for body text |
| Black text on #40507E | 2.66:1 | Fails | Lc 16.8 | Dividers and decoration only |
| #40507E text on white | 7.87:1 | AAA | Lc 87.2 | Fine for body text |
| #40507E text on black | 2.66:1 | 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D2D9EB
oklch(88.5% 0.026 268.8)
-
Step 300
300
#B4C0DF
oklch(80.9% 0.046 268.6)
-
Step 400
400
#8D9FCF
oklch(70.6% 0.073 268.5)
-
Step 500
500
#7187C3
oklch(63.1% 0.094 268.2)
-
Step 600
600
#5A70AF
oklch(55.6% 0.102 268.4)
-
Step 700
700
#4A5E97
oklch(49.2% 0.095 268.2)
-
Step 800
800 (this color)
#40507E
oklch(43.9% 0.079 268.5)
-
Step 900
900
#344062
oklch(37.7% 0.061 268.6)
-
Step 950
950
#1E263A
oklch(27.1% 0.039 267.1)
#40507E 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) | #3F5480 | 0.012 |
| Deuteranopia (no green cones) | #394F7D | 0.010 |
| Tritanopia (no blue cones) | #285A61 | 0.071 |
| Achromatopsia (no color) | #525252 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40507E
#40507E
oklch(43.9% 0.079 268.5)
- #644F15
#644F15
oklch(43.8% 0.079 88.1)
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 #40507E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.025
- Twilight #4E518B ΔE 0.030
- Light Navy Blue #2E5A88 ΔE 0.034
- Dusk Blue #26538D ΔE 0.035
- YInMn Blue #415A77 ΔE 0.035
- Denim Blue #3B5B92 ΔE 0.040
- Dusty Grape #545775 ΔE 0.042
- Light Navy #155084 ΔE 0.043
Use #40507E 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.