#404D4B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.8% 0.017 185.2), rgb(64, 77, 75).
Aa
White text reads best on this color (8.81:1).
About this color
#404D4B is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.017. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.022 away. White text reads best on it, at 8.81:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.017) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #404D4B |
| RGB | rgb(64, 77, 75) |
| HSL | hsl(171, 9%, 28%) |
| OKLCH | oklch(40.8% 0.017 185.2) |
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 #404D4B | 8.81:1 | AAA | Lc -94.6 | Preferred for body text |
| Black text on #404D4B | 2.38:1 | Fails | Lc 13.8 | Not readable |
| #404D4B text on white | 8.81:1 | AAA | Lc 90.2 | Preferred for body text |
| #404D4B text on black | 2.38:1 | Fails | Lc -12.1 | 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
#F4F6F5
oklch(97.1% 0.002 165.1)
-
Step 100
100
#E8EAEA
oklch(93.6% 0.002 197.1)
-
Step 200
200
#D5DAD9
oklch(88.4% 0.006 183)
-
Step 300
300
#BAC3C1
oklch(81% 0.01 181.3)
-
Step 400
400
#96A4A2
oklch(70.7% 0.016 186.5)
-
Step 500
500
#7D8E8B
oklch(63.2% 0.02 183.9)
-
Step 600
600
#667875
oklch(55.7% 0.022 184.4)
-
Step 700
700
#546562
oklch(49.2% 0.021 183.6)
-
Step 800
800 (this color)
#404D4B
oklch(40.8% 0.017 185.2)
-
Step 900
900
#3A4442
oklch(37.7% 0.014 182.2)
-
Step 950
950
#222827
oklch(27.1% 0.009 184.6)
#404D4B 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) | #4C4B4B | 0.019 |
| Deuteranopia (no green cones) | #494A4B | 0.016 |
| Tritanopia (no blue cones) | #3D4E4C | 0.005 |
| Achromatopsia (no color) | #4A4A4A | 0.017 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404D4B
#404D4B
oklch(40.8% 0.017 185.2)
- #524648
#524648
oklch(40.7% 0.017 6.5)
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 #404D4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.022
- Charcoal Grey #3C4142 ΔE 0.039
- Charcoal #264653 ΔE 0.047
- Dark Grey Blue #29465B ΔE 0.051
- Deep Teal #00555A ΔE 0.054
- Dark Teal #014D4E ΔE 0.055
- Dark Blue Green #005249 ΔE 0.055
- Onyx #343A40 ΔE 0.065
Use #404D4B 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.