#404A56
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.5% 0.024 253.1), rgb(64, 74, 86).
Aa
White text reads best on this color (9.00:1).
About this color
#404A56 is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.024. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.032 away. White text reads best on it, at 9.00:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.024) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.33:1 |
| White text | 9.00:1 |
Values
| HEX | #404A56 |
| RGB | rgb(64, 74, 86) |
| HSL | hsl(213, 15%, 29%) |
| OKLCH | oklch(40.5% 0.024 253.1) |
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 #404A56 | 9.00:1 | AAA | Lc -95.1 | Preferred for body text |
| Black text on #404A56 | 2.33:1 | Fails | Lc 13.3 | Not readable |
| #404A56 text on white | 9.00:1 | AAA | Lc 90.7 | Preferred for body text |
| #404A56 text on black | 2.33:1 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D6D9DE
oklch(88.4% 0.008 260.7)
-
Step 300
300
#BAC1CA
oklch(80.8% 0.015 254.6)
-
Step 400
400
#97A2AF
oklch(70.8% 0.023 252.6)
-
Step 500
500
#7E8B9B
oklch(63.2% 0.028 253.7)
-
Step 600
600
#677586
oklch(55.7% 0.031 253.4)
-
Step 700
700
#556271
oklch(49.1% 0.029 252.1)
-
Step 800
800 (this color)
#404A56
oklch(40.5% 0.024 253.1)
-
Step 900
900
#3B424C
oklch(37.7% 0.02 257.3)
-
Step 950
950
#22272C
oklch(27% 0.012 248.3)
#404A56 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) | #464A57 | 0.010 |
| Deuteranopia (no green cones) | #434856 | 0.007 |
| Tritanopia (no blue cones) | #3A4D4E | 0.021 |
| Achromatopsia (no color) | #494949 | 0.024 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404A56
#404A56
oklch(40.5% 0.024 253.1)
- #51473B
#51473B
oklch(40.4% 0.024 72.1)
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 #404A56, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.036
- Charcoal #264653 ΔE 0.039
- Charcoal Grey #3C4142 ΔE 0.039
- Deep Teal #00555A ΔE 0.058
- Dark Teal #014D4E ΔE 0.060
- Onyx #343A40 ΔE 0.061
- YInMn Blue #415A77 ΔE 0.064
Use #404A56 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.