#404C52
Closest named color: Dark Slate Gray (#2F4F4F). oklch(40.8% 0.018 229.4), rgb(64, 76, 82).
Aa
White text reads best on this color (8.84:1).
About this color
#404C52 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 0.025 away. White text reads best on it, at 8.84:1.
| Hue family | Neutrals |
| Lightness | dark (41%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.37:1 |
| White text | 8.84:1 |
Values
| HEX | #404C52 |
| RGB | rgb(64, 76, 82) |
| HSL | hsl(200, 12%, 29%) |
| OKLCH | oklch(40.8% 0.018 229.4) |
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 #404C52 | 8.84:1 | AAA | Lc -94.7 | Preferred for body text |
| Black text on #404C52 | 2.37:1 | Fails | Lc 13.7 | Not readable |
| #404C52 text on white | 8.84:1 | AAA | Lc 90.3 | Preferred for body text |
| #404C52 text on black | 2.37:1 | Fails | Lc -12.0 | 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
#E8EAEB
oklch(93.6% 0.003 228.8)
-
Step 200
200
#D5DADC
oklch(88.5% 0.006 223.5)
-
Step 300
300
#BAC2C6
oklch(80.9% 0.011 228.9)
-
Step 400
400
#96A3A9
oklch(70.7% 0.017 227.1)
-
Step 500
500
#7C8C94
oklch(63% 0.022 229.3)
-
Step 600
600
#65767F
oklch(55.5% 0.025 230.9)
-
Step 700
700
#54636B
oklch(49% 0.022 231.1)
-
Step 800
800 (this color)
#404C52
oklch(40.8% 0.018 229.4)
-
Step 900
900
#3A4348
oklch(37.7% 0.015 232.1)
-
Step 950
950
#22272A
oklch(26.9% 0.009 234.1)
#404C52 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) | #494B52 | 0.014 |
| Deuteranopia (no green cones) | #464952 | 0.013 |
| Tritanopia (no blue cones) | #3B4E4E | 0.013 |
| Achromatopsia (no color) | #4A4A4A | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #404C52
#404C52
oklch(40.8% 0.018 229.4)
- #534741
#534741
oklch(40.8% 0.019 48.2)
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 #404C52, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.025
- Charcoal Grey #3C4142 ΔE 0.039
- Charcoal #264653 ΔE 0.042
- Dark Grey Blue #29465B ΔE 0.042
- Deep Teal #00555A ΔE 0.054
- Dark Teal #014D4E ΔE 0.057
- Dark Blue Green #005249 ΔE 0.061
- Onyx #343A40 ΔE 0.064
Use #404C52 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.