#404E5C
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.7% 0.029 248.5), rgb(64, 78, 92).
Aa
White text reads best on this color (8.52:1).
About this color
#404E5C is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.034 away. White text reads best on it, at 8.52:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.46:1 |
| White text | 8.52:1 |
Values
| HEX | #404E5C |
| RGB | rgb(64, 78, 92) |
| HSL | hsl(210, 18%, 31%) |
| OKLCH | oklch(41.7% 0.029 248.5) |
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 #404E5C | 8.52:1 | AAA | Lc -93.9 | Preferred for body text |
| Black text on #404E5C | 2.46:1 | Fails | Lc 14.6 | Not readable |
| #404E5C text on white | 8.52:1 | AAA | Lc 89.3 | Fine for body text |
| #404E5C text on black | 2.46:1 | Fails | Lc -12.9 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DADF
oklch(88.5% 0.009 242.9)
-
Step 300
300
#B8C2CB
oklch(80.9% 0.017 245.1)
-
Step 400
400
#94A2B1
oklch(70.6% 0.027 250.1)
-
Step 500
500
#798C9E
oklch(63.1% 0.035 246.9)
-
Step 600
600
#627689
oklch(55.7% 0.038 247.2)
-
Step 700
700
#516374
oklch(49.1% 0.035 247)
-
Step 800
800 (this color)
#404E5C
oklch(41.7% 0.029 248.5)
-
Step 900
900
#38434D
oklch(37.7% 0.022 245.9)
-
Step 950
950
#21272D
oklch(26.9% 0.014 248.4)
#404E5C 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) | #494E5D | 0.014 |
| Deuteranopia (no green cones) | #454B5C | 0.011 |
| Tritanopia (no blue cones) | #385153 | 0.024 |
| Achromatopsia (no color) | #4C4C4C | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404E5C
#404E5C
oklch(41.7% 0.029 248.5)
- #574A3B
#574A3B
oklch(41.8% 0.03 70.9)
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 #404E5C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.034
- Dark Grey Blue #29465B ΔE 0.042
- Charcoal #264653 ΔE 0.047
- YInMn Blue #415A77 ΔE 0.050
- Charcoal Grey #3C4142 ΔE 0.052
- Deep Teal #00555A ΔE 0.055
- Dusty Grape #545775 ΔE 0.056
- Petrol #005F6A ΔE 0.063
Use #404E5C 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.