#556D91
Closest named color: Metallic Blue (#4F738E). oklch(53% 0.064 258.3), rgb(85, 109, 145).
Aa
White text reads best on this color (5.27:1).
About this color
#556D91 is a medium-dark, muted blue. In OKLCH its lightness is 53%, its chroma 0.064 and its hue 258°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.020 away. White text reads best on it, at 5.27:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.064) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.98:1 |
| White text | 5.27:1 |
Values
| HEX | #556D91 |
| RGB | rgb(85, 109, 145) |
| HSL | hsl(216, 26%, 45%) |
| OKLCH | oklch(53% 0.064 258.3) |
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 #556D91 | 5.27:1 | AA | Lc -81.5 | Fine for body text |
| Black text on #556D91 | 3.98:1 | AA large text | Lc 27.9 | Dividers and decoration only |
| #556D91 text on white | 5.27:1 | AA | Lc 76.2 | Fine for body text |
| #556D91 text on black | 3.98:1 | AA large text | Lc -25.6 | 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 600.
-
Step 50
50
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D3DAE4
oklch(88.6% 0.016 257.2)
-
Step 300
300
#B5C2D4
oklch(81% 0.029 256.5)
-
Step 400
400
#8FA2BE
oklch(70.7% 0.046 258)
-
Step 500
500
#748BAD
oklch(63.1% 0.058 258)
-
Step 600
600 (this color)
#556D91
oklch(53% 0.064 258.3)
-
Step 700
700
#4C6283
oklch(49.2% 0.06 258.3)
-
Step 800
800
#3E506A
oklch(42.7% 0.049 257.5)
-
Step 900
900
#354256
oklch(37.6% 0.038 258.9)
-
Step 950
950
#1F2732
oklch(27% 0.024 256.4)
#556D91 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) | #606F93 | 0.017 |
| Deuteranopia (no green cones) | #596990 | 0.012 |
| Tritanopia (no blue cones) | #407579 | 0.057 |
| Achromatopsia (no color) | #6C6C6C | 0.064 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556D91
#556D91
oklch(53% 0.064 258.3)
- #806740
#806740
oklch(52.9% 0.064 77.8)
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 #556D91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.020
- Dull Blue #49759C ΔE 0.026
- Muted Blue #3B719F ΔE 0.033
- Stormy Blue #507B9C ΔE 0.040
- Cerulean #457B9D ΔE 0.041
- Flat Blue #3C73A8 ΔE 0.042
- Denim #3B638C ΔE 0.046
- Dusky Blue #475F94 ΔE 0.048
Use #556D91 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.