#405156
Closest named color: Dark Slate Gray (#2F4F4F). oklch(42.2% 0.023 217.6), rgb(64, 81, 86).
Aa
White text reads best on this color (8.30:1).
About this color
#405156 is a dark close to neutral grey. In OKLCH its lightness is 42%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.027 away. White text reads best on it, at 8.30:1.
| Hue family | Neutrals |
| Lightness | dark (42%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.52:1 |
| White text | 8.30:1 |
Values
| HEX | #405156 |
| RGB | rgb(64, 81, 86) |
| HSL | hsl(194, 15%, 29%) |
| OKLCH | oklch(42.2% 0.023 217.6) |
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 #405156 | 8.30:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #405156 | 2.52:1 | Fails | Lc 15.3 | Dividers and decoration only |
| #405156 text on white | 8.30:1 | AAA | Lc 88.7 | Fine for body text |
| #405156 text on black | 2.52:1 | Fails | Lc -13.5 | 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
#E7EAEB
oklch(93.5% 0.004 219.5)
-
Step 200
200
#D4DADC
oklch(88.4% 0.007 219.6)
-
Step 300
300
#B8C3C6
oklch(81% 0.013 215.8)
-
Step 400
400
#92A4A9
oklch(70.6% 0.022 216.3)
-
Step 500
500
#788E94
oklch(63.1% 0.027 216)
-
Step 600
600
#60787F
oklch(55.6% 0.03 217.4)
-
Step 700
700
#4F656B
oklch(49.1% 0.028 216.2)
-
Step 800
800 (this color)
#405156
oklch(42.2% 0.023 217.6)
-
Step 900
900
#374448
oklch(37.7% 0.018 218.4)
-
Step 950
950
#20282A
oklch(27% 0.012 214.5)
#405156 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) | #4E5056 | 0.021 |
| Deuteranopia (no green cones) | #4A4D56 | 0.018 |
| Tritanopia (no blue cones) | #395352 | 0.014 |
| Achromatopsia (no color) | #4E4E4E | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #405156
#405156
oklch(42.2% 0.023 217.6)
- #594A45
#594A45
oklch(42.3% 0.022 39.3)
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 #405156, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.027
- Deep Teal #00555A ΔE 0.050
- Dark Grey Blue #29465B ΔE 0.052
- Charcoal #264653 ΔE 0.052
- Charcoal Grey #3C4142 ΔE 0.054
- YInMn Blue #415A77 ΔE 0.055
- Petrol #005F6A ΔE 0.058
- Dark Teal #014D4E ΔE 0.060
Use #405156 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.