#404B42
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40% 0.021 150.6), rgb(64, 75, 66).
Aa
White text reads best on this color (9.11:1).
About this color
#404B42 is a dark close to neutral grey. In OKLCH its lightness is 40%, its chroma 0.021. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.028 away. White text reads best on it, at 9.11:1.
| Hue family | Neutrals |
| Lightness | dark (40%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.30:1 |
| White text | 9.11:1 |
Values
| HEX | #404B42 |
| RGB | rgb(64, 75, 66) |
| HSL | hsl(131, 8%, 27%) |
| OKLCH | oklch(40% 0.021 150.6) |
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 #404B42 | 9.11:1 | AAA | Lc -95.4 | Preferred for body text |
| Black text on #404B42 | 2.30:1 | Fails | Lc 13.0 | Not readable |
| #404B42 text on white | 9.11:1 | AAA | Lc 91.0 | Preferred for body text |
| #404B42 text on black | 2.30:1 | Fails | Lc -11.3 | 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 900.
-
Step 50
50
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E8EBE8
oklch(93.7% 0.005 145.5)
-
Step 200
200
#D5DBD6
oklch(88.5% 0.009 150.7)
-
Step 300
300
#BAC4BB
oklch(81% 0.017 148.4)
-
Step 400
400
#96A599
oklch(70.7% 0.024 151.5)
-
Step 500
500
#7C8F80
oklch(63% 0.031 151.6)
-
Step 600
600
#657969
oklch(55.5% 0.034 151)
-
Step 700
700
#546657
oklch(49.1% 0.032 149.9)
-
Step 800
800
#455348
oklch(42.7% 0.025 151.6)
-
Step 900
900 (this color)
#404B42
oklch(40% 0.021 150.6)
-
Step 950
950
#222823
oklch(26.9% 0.013 150.2)
#404B42 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) | #4B4942 | 0.018 |
| Deuteranopia (no green cones) | #494842 | 0.016 |
| Tritanopia (no blue cones) | #3F4B48 | 0.010 |
| Achromatopsia (no color) | #484848 | 0.021 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404B42
#404B42
oklch(40% 0.021 150.6)
- #4E444D
#4E444D
oklch(40% 0.02 329.1)
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 #404B42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.028
- Charcoal Grey #3C4142 ΔE 0.034
- Charcoal #264653 ΔE 0.050
- Dark Blue Green #005249 ΔE 0.054
- Dark Teal #014D4E ΔE 0.056
- Dark Grey Blue #29465B ΔE 0.058
- Deep Teal #00555A ΔE 0.060
- Onyx #343A40 ΔE 0.061
Use #404B42 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.