#404C5B
Closest named color: Dark Slate Gray (#2F4F4F). oklch(41.2% 0.03 254.2), rgb(64, 76, 91).
Aa
White text reads best on this color (8.73:1).
About this color
#404C5B is a dark close to neutral grey. In OKLCH its lightness is 41%, its chroma 0.030. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.035 away. White text reads best on it, at 8.73:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.030) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.40:1 |
| White text | 8.73:1 |
Values
| HEX | #404C5B |
| RGB | rgb(64, 76, 91) |
| HSL | hsl(213, 17%, 30%) |
| OKLCH | oklch(41.2% 0.03 254.2) |
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 #404C5B | 8.73:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #404C5B | 2.40:1 | Fails | Lc 14.0 | Not readable |
| #404C5B text on white | 8.73:1 | AAA | Lc 89.9 | Fine for body text |
| #404C5B text on black | 2.40:1 | Fails | Lc -12.3 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E8EAED
oklch(93.6% 0.005 258.3)
-
Step 200
200
#D5DADF
oklch(88.6% 0.009 247.9)
-
Step 300
300
#B9C1CC
oklch(80.8% 0.018 256.3)
-
Step 400
400
#95A2B2
oklch(70.7% 0.028 253.6)
-
Step 500
500
#7B8B9F
oklch(63.1% 0.035 254.1)
-
Step 600
600
#64758A
oklch(55.6% 0.039 253.9)
-
Step 700
700
#536275
oklch(49.1% 0.036 254.5)
-
Step 800
800 (this color)
#404C5B
oklch(41.2% 0.03 254.2)
-
Step 900
900
#39424E
oklch(37.6% 0.024 255.7)
-
Step 950
950
#22272E
oklch(27.1% 0.015 256.8)
#404C5B 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) | #474C5C | 0.011 |
| Deuteranopia (no green cones) | #444A5B | 0.008 |
| Tritanopia (no blue cones) | #384F51 | 0.025 |
| Achromatopsia (no color) | #4B4B4B | 0.030 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404C5B
#404C5B
oklch(41.2% 0.03 254.2)
- #554939
#554939
oklch(41.3% 0.03 74.8)
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 #404C5B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.035
- Dark Grey Blue #29465B ΔE 0.038
- Charcoal #264653 ΔE 0.043
- Charcoal Grey #3C4142 ΔE 0.048
- YInMn Blue #415A77 ΔE 0.055
- Deep Teal #00555A ΔE 0.057
- Dusty Grape #545775 ΔE 0.060
- Dark Teal #014D4E ΔE 0.063
Use #404C5B 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.