#556A78
Closest named color: Slate (#516572). oklch(51.2% 0.034 237.5), rgb(85, 106, 120).
Aa
White text reads best on this color (5.64:1).
About this color
#556A78 is a medium-dark, muted blue. In OKLCH its lightness is 51%, its chroma 0.034 and its hue 238°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.017 away. White text reads best on it, at 5.64:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | muted (0.034) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.71:1 |
| White text | 5.64:1 |
Values
| HEX | #556A78 |
| RGB | rgb(85, 106, 120) |
| HSL | hsl(204, 17%, 40%) |
| OKLCH | oklch(51.2% 0.034 237.5) |
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 #556A78 | 5.64:1 | AA | Lc -83.5 | Fine for body text |
| Black text on #556A78 | 3.71:1 | AA large text | Lc 25.8 | Dividers and decoration only |
| #556A78 text on white | 5.64:1 | AA | Lc 78.2 | Fine for body text |
| #556A78 text on black | 3.71:1 | AA large text | Lc -23.6 | Dividers and decoration only |
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 700.
-
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
#D4DADE
oklch(88.5% 0.009 236.6)
-
Step 300
300
#B7C2CA
oklch(80.8% 0.017 239.2)
-
Step 400
400
#92A3AF
oklch(70.6% 0.026 238.6)
-
Step 500
500
#778D9B
oklch(63.1% 0.033 236)
-
Step 600
600
#607786
oklch(55.6% 0.036 236.9)
-
Step 700
700 (this color)
#556A78
oklch(51.2% 0.034 237.5)
-
Step 800
800
#41525D
oklch(42.8% 0.028 236.7)
-
Step 900
900
#37434C
oklch(37.6% 0.022 240.6)
-
Step 950
950
#20282C
oklch(27.1% 0.014 229.5)
#556A78 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) | #646979 | 0.021 |
| Deuteranopia (no green cones) | #5F6578 | 0.019 |
| Tritanopia (no blue cones) | #4A6E6E | 0.027 |
| Achromatopsia (no color) | #676767 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556A78
#556A78
oklch(51.2% 0.034 237.5)
- #766254
#766254
oklch(51.2% 0.034 56.9)
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 #556A78, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.017
- Dim Gray #696969 ΔE 0.035
- Metallic Blue #4F738E ΔE 0.037
- Battleship Gray #6C757D ΔE 0.048
- Denim #3B638C ΔE 0.054
- Dusty Grape #545775 ΔE 0.057
- Dull Blue #49759C ΔE 0.057
- YInMn Blue #415A77 ΔE 0.058
Use #556A78 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.