#404573
Closest named color: Dark Slate Blue (#483D8B). oklch(40.8% 0.077 277.7), rgb(64, 69, 115).
Aa
White text reads best on this color (9.06:1).
About this color
#404573 is a dark, moderately saturated blue. In OKLCH its lightness is 41%, its chroma 0.077 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Slate Blue (#483D8B), ΔE 0.050 away. White text reads best on it, at 9.06:1.
| Hue family | Blues |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Dark Slate Blue (#483D8B) |
| Black text | 2.31:1 |
| White text | 9.06:1 |
Values
| HEX | #404573 |
| RGB | rgb(64, 69, 115) |
| HSL | hsl(234, 28%, 35%) |
| OKLCH | oklch(40.8% 0.077 277.7) |
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 #404573 | 9.06:1 | AAA | Lc -95.2 | Preferred for body text |
| Black text on #404573 | 2.31:1 | Fails | Lc 13.2 | Not readable |
| #404573 text on white | 9.06:1 | AAA | Lc 90.8 | Preferred for body text |
| #404573 text on black | 2.31:1 | Fails | Lc -11.6 | 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
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D5D8EA
oklch(88.5% 0.025 278.3)
-
Step 300
300
#B9BEDE
oklch(80.8% 0.045 278.3)
-
Step 400
400
#959DCE
oklch(70.7% 0.072 277.2)
-
Step 500
500
#7C84C1
oklch(63.1% 0.092 277.7)
-
Step 600
600
#656DAD
oklch(55.6% 0.1 277.2)
-
Step 700
700
#545B95
oklch(49.2% 0.093 277.2)
-
Step 800
800 (this color)
#404573
oklch(40.8% 0.077 277.7)
-
Step 900
900
#3A3E61
oklch(37.6% 0.06 278.1)
-
Step 950
950
#222539
oklch(27.1% 0.037 277)
#404573 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) | #354B75 | 0.021 |
| Deuteranopia (no green cones) | #314772 | 0.021 |
| Tritanopia (no blue cones) | #304E56 | 0.068 |
| Achromatopsia (no color) | #494949 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404573
#404573
oklch(40.8% 0.077 277.7)
- #554A0E
#554A0E
oklch(40.9% 0.077 98.2)
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 #404573, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Blue #483D8B ΔE 0.050
- Dusk #4E5481 ΔE 0.053
- Light Navy #155084 ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.054
- Twilight #4E518B ΔE 0.055
- Dusk Blue #26538D ΔE 0.057
- Twilight Blue #0A437A ΔE 0.057
- Cobalt #1E488F ΔE 0.058
Use #404573 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.