#404F5B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.9% 0.028 242.5), rgb(64, 79, 91).
Aa
White text reads best on this color (8.44:1).
About this color
#404F5B is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.028. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.032 away. White text reads best on it, at 8.44:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.48:1 |
| White text | 8.44:1 |
Values
| HEX | #404F5B |
| RGB | rgb(64, 79, 91) |
| HSL | hsl(207, 17%, 30%) |
| OKLCH | oklch(41.9% 0.028 242.5) |
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 #404F5B | 8.44:1 | AAA | Lc -93.6 | Preferred for body text |
| Black text on #404F5B | 2.48:1 | Fails | Lc 14.9 | Not readable |
| #404F5B text on white | 8.44:1 | AAA | Lc 89.1 | Fine for body text |
| #404F5B text on black | 2.48:1 | Fails | Lc -13.1 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DADF
oklch(88.5% 0.009 242.9)
-
Step 300
300
#B8C2CA
oklch(80.9% 0.016 241.8)
-
Step 400
400
#93A3B0
oklch(70.7% 0.026 242.5)
-
Step 500
500
#798C9C
oklch(63.1% 0.033 243.7)
-
Step 600
600
#617687
oklch(55.5% 0.036 242.8)
-
Step 700
700
#506372
oklch(49% 0.033 242.2)
-
Step 800
800 (this color)
#404F5B
oklch(41.9% 0.028 242.5)
-
Step 900
900
#38434C
oklch(37.7% 0.021 243)
-
Step 950
950
#21272D
oklch(26.9% 0.014 248.4)
#404F5B 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) | #4A4F5C | 0.015 |
| Deuteranopia (no green cones) | #474C5B | 0.013 |
| Tritanopia (no blue cones) | #385253 | 0.022 |
| Achromatopsia (no color) | #4D4D4D | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404F5B
#404F5B
oklch(41.9% 0.028 242.5)
- #584A3E
#584A3E
oklch(42% 0.027 62.6)
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 #404F5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.032
- Dark Grey Blue #29465B ΔE 0.045
- Charcoal #264653 ΔE 0.048
- YInMn Blue #415A77 ΔE 0.050
- Deep Teal #00555A ΔE 0.053
- Charcoal Grey #3C4142 ΔE 0.053
- Dusty Grape #545775 ΔE 0.056
- Petrol #005F6A ΔE 0.061
Use #404F5B 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.