#40558A
Closest named color: Denim Blue (#3B5B92). oklch(45.8% 0.091 266.5), rgb(64, 85, 138).
Aa
White text reads best on this color (7.28:1).
About this color
#40558A is a medium-dark, moderately saturated blue. In OKLCH its lightness is 46%, its chroma 0.091 and its hue 267°. Its hue sits on the cool side of the wheel. The nearest named color is Denim Blue (#3B5B92), ΔE 0.019 away. White text reads best on it, at 7.28:1.
| Hue family | Blues |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Denim Blue (#3B5B92) |
| Black text | 2.88:1 |
| White text | 7.28:1 |
Values
| HEX | #40558A |
| RGB | rgb(64, 85, 138) |
| HSL | hsl(223, 37%, 40%) |
| OKLCH | oklch(45.8% 0.091 266.5) |
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 #40558A | 7.28:1 | AAA | Lc -90.0 | Preferred for body text |
| Black text on #40558A | 2.88:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #40558A text on white | 7.28:1 | AAA | Lc 85.2 | Fine for body text |
| #40558A text on black | 2.88:1 | Fails | Lc -16.8 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#D0D9ED
oklch(88.5% 0.029 266.4)
-
Step 300
300
#B1C0E4
oklch(80.8% 0.054 267.4)
-
Step 400
400
#889FD6
oklch(70.6% 0.085 266.7)
-
Step 500
500
#6B87CB
oklch(63.1% 0.108 266.3)
-
Step 600
600
#5370B8
oklch(55.6% 0.117 266.1)
-
Step 700
700
#445D9F
oklch(49.1% 0.11 266.7)
-
Step 800
800 (this color)
#40558A
oklch(45.8% 0.091 266.5)
-
Step 900
900
#304067
oklch(37.7% 0.07 266.2)
-
Step 950
950
#1C263C
oklch(27.1% 0.044 265)
#40558A 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) | #405A8C | 0.014 |
| Deuteranopia (no green cones) | #385389 | 0.012 |
| Tritanopia (no blue cones) | #1D6069 | 0.080 |
| Achromatopsia (no color) | #575757 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40558A
#40558A
oklch(45.8% 0.091 266.5)
- #6D5307
#6D5307
oklch(45.7% 0.091 86.8)
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 #40558A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Denim Blue #3B5B92 ΔE 0.019
- Twilight #4E518B ΔE 0.022
- Dusk #4E5481 ΔE 0.023
- Light Navy Blue #2E5A88 ΔE 0.024
- Dusk Blue #26538D ΔE 0.030
- Dusky Blue #475F94 ΔE 0.033
- YInMn Blue #415A77 ΔE 0.038
- Denim #3B638C ΔE 0.041
Use #40558A 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.