#404E4B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.1% 0.018 180.9), rgb(64, 78, 75).
Aa
White text reads best on this color (8.71:1).
About this color
#404E4B is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.018. 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 8.71:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.40:1 |
| White text | 8.71:1 |
Values
| HEX | #404E4B |
| RGB | rgb(64, 78, 75) |
| HSL | hsl(167, 10%, 28%) |
| OKLCH | oklch(41.1% 0.018 180.9) |
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 #404E4B | 8.71:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #404E4B | 2.40:1 | Fails | Lc 14.1 | Not readable |
| #404E4B text on white | 8.71:1 | AAA | Lc 89.9 | Fine for body text |
| #404E4B text on black | 2.40:1 | Fails | Lc -12.4 | 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
#96A4A1
oklch(70.7% 0.016 181.6)
-
Step 500
500
#7C8E8A
oklch(63.1% 0.022 180.7)
-
Step 600
600
#657874
oklch(55.6% 0.023 181.3)
-
Step 700
700
#536561
oklch(49% 0.023 180.3)
-
Step 800
800 (this color)
#404E4B
oklch(41.1% 0.018 180.9)
-
Step 900
900
#3A4442
oklch(37.7% 0.014 182.2)
-
Step 950
950
#222827
oklch(27.1% 0.009 184.6)
#404E4B 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) | #4D4C4B | 0.020 |
| Deuteranopia (no green cones) | #4A4A4B | 0.019 |
| Tritanopia (no blue cones) | #3D4F4D | 0.005 |
| Achromatopsia (no color) | #4B4B4B | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404E4B
#404E4B
oklch(41.1% 0.018 180.9)
- #54474A
#54474A
oklch(41.2% 0.018 2.3)
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 #404E4B, 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 0.042
- Charcoal #264653 ΔE 0.049
- Deep Teal #00555A ΔE 0.053
- Dark Grey Blue #29465B ΔE 0.053
- Dark Blue Green #005249 ΔE 0.055
- Dark Teal #014D4E ΔE 0.056
- Dark Green Blue #1F6357 ΔE 0.067
Use #404E4B 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.