#404B79
Closest named color: Dusk (#4E5481). oklch(42.5% 0.078 272.5), rgb(64, 75, 121).
Aa
White text reads best on this color (8.39:1).
About this color
#404B79 is a dark, moderately saturated blue. In OKLCH its lightness is 43%, its chroma 0.078 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.036 away. White text reads best on it, at 8.39:1.
| Hue family | Blues |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.50:1 |
| White text | 8.39:1 |
Values
| HEX | #404B79 |
| RGB | rgb(64, 75, 121) |
| HSL | hsl(228, 31%, 36%) |
| OKLCH | oklch(42.5% 0.078 272.5) |
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 #404B79 | 8.39:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #404B79 | 2.50:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #404B79 text on white | 8.39:1 | AAA | Lc 88.9 | Fine for body text |
| #404B79 text on black | 2.50:1 | Fails | Lc -13.3 | 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
#D3D8EA
oklch(88.4% 0.025 273.5)
-
Step 300
300
#B6BFDF
oklch(80.8% 0.046 272.9)
-
Step 400
400
#919ECF
oklch(70.7% 0.073 272.9)
-
Step 500
500
#7686C2
oklch(63.2% 0.093 272.1)
-
Step 600
600
#5F6FAE
oklch(55.6% 0.1 272)
-
Step 700
700
#4F5C96
oklch(49.1% 0.094 272.9)
-
Step 800
800 (this color)
#404B79
oklch(42.5% 0.078 272.5)
-
Step 900
900
#373F62
oklch(37.7% 0.061 273.3)
-
Step 950
950
#202539
oklch(26.9% 0.038 272.9)
#404B79 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) | #3A507B | 0.016 |
| Deuteranopia (no green cones) | #354B78 | 0.015 |
| Tritanopia (no blue cones) | #2C545C | 0.068 |
| Achromatopsia (no color) | #4D4D4D | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404B79
#404B79
oklch(42.5% 0.078 272.5)
- #5D4D12
#5D4D12
oklch(42.5% 0.078 93.1)
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 #404B79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.036
- Twilight #4E518B ΔE 0.040
- Dusk Blue #26538D ΔE 0.043
- Light Navy #155084 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.047
- Dusty Grape #545775 ΔE 0.051
- Deep Sea Blue #015482 ΔE 0.052
Use #404B79 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.