#404F4B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.3% 0.02 177.3), rgb(64, 79, 75).
Aa
White text reads best on this color (8.61:1).
About this color
#404F4B is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.020. 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 8.61:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.43:1 |
| White text | 8.61:1 |
Values
| HEX | #404F4B |
| RGB | rgb(64, 79, 75) |
| HSL | hsl(164, 10%, 28%) |
| OKLCH | oklch(41.3% 0.02 177.3) |
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 #404F4B | 8.61:1 | AAA | Lc -94.1 | Preferred for body text |
| Black text on #404F4B | 2.43:1 | Fails | Lc 14.4 | Not readable |
| #404F4B text on white | 8.61:1 | AAA | Lc 89.6 | Fine for body text |
| #404F4B text on black | 2.43:1 | Fails | Lc -12.7 | 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
#B9C3C0
oklch(80.9% 0.012 176.2)
-
Step 400
400
#95A5A0
oklch(70.8% 0.019 175.1)
-
Step 500
500
#7B8E89
oklch(63% 0.023 177.9)
-
Step 600
600
#647973
oklch(55.7% 0.026 176.1)
-
Step 700
700
#536560
oklch(49% 0.023 176.6)
-
Step 800
800 (this color)
#404F4B
oklch(41.3% 0.02 177.3)
-
Step 900
900
#394441
oklch(37.6% 0.015 177.2)
-
Step 950
950
#222826
oklch(27% 0.009 173.5)
#404F4B 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) | #4E4D4B | 0.022 |
| Deuteranopia (no green cones) | #4B4B4B | 0.020 |
| Tritanopia (no blue cones) | #3C4F4E | 0.007 |
| Achromatopsia (no color) | #4C4C4C | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404F4B
#404F4B
oklch(41.3% 0.02 177.3)
- #55474B
#55474B
oklch(41.4% 0.02 358.9)
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 #404F4B, 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 0.045
- Charcoal #264653 ΔE 0.051
- Deep Teal #00555A ΔE 0.052
- Dark Blue Green #005249 ΔE 0.054
- Dark Grey Blue #29465B ΔE 0.056
- Dark Teal #014D4E ΔE 0.056
- Dark Green Blue #1F6357 ΔE 0.064
Use #404F4B 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.