#40537F
Closest named color: Dusk (#4E5481). oklch(44.7% 0.076 265.6), rgb(64, 83, 127).
Aa
White text reads best on this color (7.60:1).
About this color
#40537F is a dark, moderately saturated blue. In OKLCH its lightness is 45%, its chroma 0.076 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.021 away. White text reads best on it, at 7.60:1.
| Hue family | Blues |
| Lightness | dark (45%) |
| Chroma | moderately saturated (0.076) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.76:1 |
| White text | 7.60:1 |
Values
| HEX | #40537F |
| RGB | rgb(64, 83, 127) |
| HSL | hsl(222, 33%, 37%) |
| OKLCH | oklch(44.7% 0.076 265.6) |
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 #40537F | 7.60:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #40537F | 2.76:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #40537F text on white | 7.60:1 | AAA | Lc 86.3 | Fine for body text |
| #40537F text on black | 2.76:1 | Fails | Lc -15.7 | 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 800.
-
Step 50
50
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D1D9EA
oklch(88.4% 0.025 265.6)
-
Step 300
300
#B3C1DE
oklch(81% 0.044 264.9)
-
Step 400
400
#8BA0CE
oklch(70.6% 0.072 265.5)
-
Step 500
500
#6F88C1
oklch(63.1% 0.091 265.7)
-
Step 600
600
#5771AE
oklch(55.5% 0.1 265.7)
-
Step 700
700
#475F95
oklch(49.1% 0.092 265)
-
Step 800
800 (this color)
#40537F
oklch(44.7% 0.076 265.6)
-
Step 900
900
#324161
oklch(37.7% 0.059 264.6)
-
Step 950
950
#1E2639
oklch(27% 0.037 266.4)
#40537F 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) | #435781 | 0.013 |
| Deuteranopia (no green cones) | #3C517E | 0.009 |
| Tritanopia (no blue cones) | #265C63 | 0.068 |
| Achromatopsia (no color) | #545454 | 0.076 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40537F
#40537F
oklch(44.7% 0.076 265.6)
- #67511B
#67511B
oklch(44.7% 0.076 86.3)
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 #40537F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.021
- Light Navy Blue #2E5A88 ΔE 0.027
- YInMn Blue #415A77 ΔE 0.028
- Twilight #4E518B ΔE 0.030
- Denim Blue #3B5B92 ΔE 0.034
- Dusk Blue #26538D ΔE 0.035
- Dusty Grape #545775 ΔE 0.037
- Light Navy #155084 ΔE 0.045
Use #40537F 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.