#404F55
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.7% 0.021 224.1), rgb(64, 79, 85).
Aa
White text reads best on this color (8.51:1).
About this color
#404F55 is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.021. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.026 away. White text reads best on it, at 8.51:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.46:1 |
| White text | 8.51:1 |
Values
| HEX | #404F55 |
| RGB | rgb(64, 79, 85) |
| HSL | hsl(197, 14%, 29%) |
| OKLCH | oklch(41.7% 0.021 224.1) |
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 #404F55 | 8.51:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #404F55 | 2.46:1 | Fails | Lc 14.7 | Not readable |
| #404F55 text on white | 8.51:1 | AAA | Lc 89.3 | Fine for body text |
| #404F55 text on black | 2.46:1 | Fails | Lc -12.9 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADC
oklch(88.4% 0.007 219.6)
-
Step 300
300
#B8C2C7
oklch(80.8% 0.013 229)
-
Step 400
400
#94A4AA
oklch(70.8% 0.02 222.3)
-
Step 500
500
#798D95
oklch(63% 0.026 223.9)
-
Step 600
600
#627780
oklch(55.6% 0.028 225.7)
-
Step 700
700
#51646C
oklch(49% 0.026 225.3)
-
Step 800
800 (this color)
#404F55
oklch(41.7% 0.021 224.1)
-
Step 900
900
#384448
oklch(37.7% 0.017 220)
-
Step 950
950
#21282A
oklch(27.1% 0.011 216.9)
#404F55 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) | #4C4E55 | 0.018 |
| Deuteranopia (no green cones) | #484B55 | 0.017 |
| Tritanopia (no blue cones) | #3A5151 | 0.014 |
| Achromatopsia (no color) | #4D4D4D | 0.022 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404F55
#404F55
oklch(41.7% 0.021 224.1)
- #574943
#574943
oklch(41.8% 0.021 44.5)
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 #404F55, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.026
- Dark Grey Blue #29465B ΔE 0.047
- Charcoal #264653 ΔE 0.047
- Charcoal Grey #3C4142 ΔE 0.048
- Deep Teal #00555A ΔE 0.051
- YInMn Blue #415A77 ΔE 0.058
- Dark Teal #014D4E ΔE 0.059
- Dark Blue Green #005249 ΔE 0.061
Use #404F55 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.