#40475D
Closest named color: Dark Grey Blue (#29465B). oklch(40.1% 0.038 270.9), rgb(64, 71, 93).
Aa
White text reads best on this color (9.22:1).
About this color
#40475D is a dark, muted blue. In OKLCH its lightness is 40%, its chroma 0.038 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.032 away. White text reads best on it, at 9.22:1.
| Hue family | Blues |
| Lightness | dark (40%) |
| Chroma | muted (0.038) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #40475D |
| RGB | rgb(64, 71, 93) |
| HSL | hsl(226, 18%, 31%) |
| OKLCH | oklch(40.1% 0.038 270.9) |
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 #40475D | 9.22:1 | AAA | Lc -95.6 | Preferred for body text |
| Black text on #40475D | 2.27:1 | Fails | Lc 12.7 | Not readable |
| #40475D text on white | 9.22:1 | AAA | Lc 91.3 | Preferred for body text |
| #40475D text on black | 2.27:1 | Fails | Lc -11.1 | 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 900.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E8EAF0
oklch(93.7% 0.008 271.3)
-
Step 200
200
#D5D9E4
oklch(88.5% 0.016 270)
-
Step 300
300
#B9C0D4
oklch(80.9% 0.029 270.3)
-
Step 400
400
#96A0BE
oklch(70.8% 0.045 270.7)
-
Step 500
500
#7C88AE
oklch(63.1% 0.059 271)
-
Step 600
600
#657299
oklch(55.7% 0.063 270)
-
Step 700
700
#545F83
oklch(49.1% 0.06 271)
-
Step 800
800
#454E6A
oklch(42.8% 0.048 270.5)
-
Step 900
900 (this color)
#40475D
oklch(40.1% 0.038 270.9)
-
Step 950
950
#222633
oklch(27.1% 0.025 271.4)
#40475D 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) | #40495E | 0.006 |
| Deuteranopia (no green cones) | #3E465C | 0.005 |
| Tritanopia (no blue cones) | #384B4E | 0.035 |
| Achromatopsia (no color) | #474747 | 0.038 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #40475D
#40475D
oklch(40.1% 0.038 270.9)
- #504730
#504730
oklch(40.1% 0.038 89.1)
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 #40475D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.032
- Charcoal #264653 ΔE 0.041
- Charcoal Grey #3C4142 ΔE 0.046
- Dark Slate Gray #2F4F4F ΔE 0.046
- Onyx #343A40 ΔE 0.062
- YInMn Blue #415A77 ΔE 0.064
- Dusty Grape #545775 ΔE 0.067
- Dark Blue Grey #1F3B4D ΔE 0.067
Use #40475D 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.