#556C91
Closest named color: Metallic Blue (#4F738E). oklch(52.8% 0.065 259.7), rgb(85, 108, 145).
Aa
White text reads best on this color (5.32:1).
About this color
#556C91 is a medium-dark, muted blue. In OKLCH its lightness is 53%, its chroma 0.065 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.023 away. White text reads best on it, at 5.32:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.065) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.94:1 |
| White text | 5.32:1 |
Values
| HEX | #556C91 |
| RGB | rgb(85, 108, 145) |
| HSL | hsl(217, 26%, 45%) |
| OKLCH | oklch(52.8% 0.065 259.7) |
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 #556C91 | 5.32:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #556C91 | 3.94:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #556C91 text on white | 5.32:1 | AA | Lc 76.5 | Fine for body text |
| #556C91 text on black | 3.94:1 | AA large text | Lc -25.3 | 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 600.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D3DAE4
oklch(88.6% 0.016 257.2)
-
Step 300
300
#B6C1D4
oklch(80.8% 0.029 261.5)
-
Step 400
400
#90A2BE
oklch(70.8% 0.046 259.2)
-
Step 500
500
#748BAE
oklch(63.2% 0.059 258.7)
-
Step 600
600 (this color)
#556C91
oklch(52.8% 0.065 259.7)
-
Step 700
700
#4C6183
oklch(49% 0.061 259.9)
-
Step 800
800
#3F506B
oklch(42.8% 0.05 259.5)
-
Step 900
900
#354256
oklch(37.6% 0.038 258.9)
-
Step 950
950
#1F2733
oklch(27.1% 0.025 258.3)
#556C91 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) | #5F6E93 | 0.016 |
| Deuteranopia (no green cones) | #586890 | 0.012 |
| Tritanopia (no blue cones) | #407479 | 0.058 |
| Achromatopsia (no color) | #6B6B6B | 0.065 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556C91
#556C91
oklch(52.8% 0.065 259.7)
- #7F673F
#7F673F
oklch(52.8% 0.064 79.5)
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 #556C91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.023
- Dull Blue #49759C ΔE 0.028
- Muted Blue #3B719F ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.042
- Stormy Blue #507B9C ΔE 0.042
- Cerulean #457B9D ΔE 0.044
- Denim #3B638C ΔE 0.044
- Dusky Blue #475F94 ΔE 0.046
Use #556C91 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.