#404559
Closest named color: Dark Grey Blue (#29465B). oklch(39.4% 0.035 273.8), rgb(64, 69, 89).
Aa
White text reads best on this color (9.48:1).
About this color
#404559 is a dark, muted blue. In OKLCH its lightness is 39%, its chroma 0.035 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Grey Blue (#29465B), ΔE 0.031 away. White text reads best on it, at 9.48:1.
| Hue family | Blues |
| Lightness | dark (39%) |
| Chroma | muted (0.035) |
| Temperature | cool |
| Nearest name | Dark Grey Blue (#29465B) |
| Black text | 2.21:1 |
| White text | 9.48:1 |
Values
| HEX | #404559 |
| RGB | rgb(64, 69, 89) |
| HSL | hsl(228, 16%, 30%) |
| OKLCH | oklch(39.4% 0.035 273.8) |
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 #404559 | 9.48:1 | AAA | Lc -96.2 | Preferred for body text |
| Black text on #404559 | 2.21:1 | Fails | Lc 12.0 | Not readable |
| #404559 text on white | 9.48:1 | AAA | Lc 92.0 | Preferred for body text |
| #404559 text on black | 2.21:1 | Fails | Lc -10.4 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E8EAEF
oklch(93.7% 0.007 268.5)
-
Step 200
200
#D6D9E3
oklch(88.6% 0.014 272.7)
-
Step 300
300
#BBC0D2
oklch(80.9% 0.026 273.4)
-
Step 400
400
#989FBB
oklch(70.6% 0.042 274.2)
-
Step 500
500
#7F88AA
oklch(63.2% 0.052 273.3)
-
Step 600
600
#687196
oklch(55.5% 0.059 273.8)
-
Step 700
700
#575F80
oklch(49.2% 0.054 273.7)
-
Step 800
800
#474D68
oklch(42.6% 0.046 274.6)
-
Step 900
900 (this color)
#404559
oklch(39.4% 0.035 273.8)
-
Step 950
950
#232631
oklch(27% 0.021 273)
#404559 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) | #3F475A | 0.006 |
| Deuteranopia (no green cones) | #3D4559 | 0.005 |
| Tritanopia (no blue cones) | #3A494C | 0.031 |
| Achromatopsia (no color) | #464646 | 0.035 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404559
#404559
oklch(39.4% 0.035 273.8)
- #4C4631
#4C4631
oklch(39.4% 0.034 94.1)
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 #404559, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Grey Blue #29465B ΔE 0.031
- Charcoal #264653 ΔE 0.038
- Charcoal Grey #3C4142 ΔE 0.039
- Dark Slate Gray #2F4F4F ΔE 0.046
- Onyx #343A40 ΔE 0.054
- Dark Blue Grey #1F3B4D ΔE 0.062
- Dark Teal #014D4E ΔE 0.068
- Deep Teal #00555A ΔE 0.069
Use #404559 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.