#556B83
Closest named color: Metallic Blue (#4F738E). oklch(51.9% 0.046 250.9), rgb(85, 107, 131).
Aa
White text reads best on this color (5.50:1).
About this color
#556B83 is a medium-dark, muted blue. In OKLCH its lightness is 52%, its chroma 0.046 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.025 away. White text reads best on it, at 5.50:1.
| Hue family | Blues |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.046) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.81:1 |
| White text | 5.50:1 |
Values
| HEX | #556B83 |
| RGB | rgb(85, 107, 131) |
| HSL | hsl(211, 21%, 42%) |
| OKLCH | oklch(51.9% 0.046 250.9) |
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 #556B83 | 5.50:1 | AA | Lc -82.8 | Fine for body text |
| Black text on #556B83 | 3.81:1 | AA large text | Lc 26.6 | Dividers and decoration only |
| #556B83 text on white | 5.50:1 | AA | Lc 77.5 | Fine for body text |
| #556B83 text on black | 3.81:1 | AA large text | Lc -24.3 | 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
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D3DAE1
oklch(88.5% 0.012 248)
-
Step 300
300
#B6C2CF
oklch(80.9% 0.023 250.3)
-
Step 400
400
#91A3B7
oklch(70.8% 0.036 251.1)
-
Step 500
500
#758CA5
oklch(63.1% 0.046 250.7)
-
Step 600
600
#5E7690
oklch(55.7% 0.049 250.8)
-
Step 700
700 (this color)
#556B83
oklch(51.9% 0.046 250.9)
-
Step 800
800
#3F5164
oklch(42.8% 0.039 250.1)
-
Step 900
900
#364351
oklch(37.7% 0.029 250.5)
-
Step 950
950
#202730
oklch(27% 0.02 254.8)
#556B83 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) | #626C84 | 0.019 |
| Deuteranopia (no green cones) | #5C6783 | 0.014 |
| Tritanopia (no blue cones) | #477073 | 0.039 |
| Achromatopsia (no color) | #696969 | 0.046 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556B83
#556B83
oklch(51.9% 0.046 250.9)
- #7A654B
#7A654B
oklch(52% 0.047 72.5)
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 #556B83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.025
- Slate #516572 ΔE 0.030
- Dull Blue #49759C ΔE 0.043
- Denim #3B638C ΔE 0.046
- Dim Gray #696969 ΔE 0.046
- Muted Blue #3B719F ΔE 0.048
- Battleship Gray #6C757D ΔE 0.049
- Stormy Blue #507B9C ΔE 0.052
Use #556B83 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.