#556E99
Closest named color: Dull Blue (#49759C). oklch(53.7% 0.074 261), rgb(85, 110, 153).
Aa
White text reads best on this color (5.15:1).
About this color
#556E99 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.074 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.022 away. White text reads best on it, at 5.15:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.07:1 |
| White text | 5.15:1 |
Values
| HEX | #556E99 |
| RGB | rgb(85, 110, 153) |
| HSL | hsl(218, 29%, 47%) |
| OKLCH | oklch(53.7% 0.074 261) |
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 #556E99 | 5.15:1 | AA | Lc -80.8 | Fine for body text |
| Black text on #556E99 | 4.07:1 | AA large text | Lc 28.6 | Dividers and decoration only |
| #556E99 text on white | 5.15:1 | AA | Lc 75.4 | Fine for body text |
| #556E99 text on black | 4.07:1 | AA large text | Lc -26.3 | 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
#E6EAF0
oklch(93.6% 0.009 258.3)
-
Step 200
200
#D2DAE6
oklch(88.6% 0.019 258.4)
-
Step 300
300
#B5C1D7
oklch(80.9% 0.034 262.7)
-
Step 400
400
#8EA1C3
oklch(70.6% 0.054 262)
-
Step 500
500
#728AB3
oklch(63% 0.068 261)
-
Step 600
600 (this color)
#556E99
oklch(53.7% 0.074 261)
-
Step 700
700
#4A6188
oklch(49.1% 0.069 260.7)
-
Step 800
800
#3D4F6F
oklch(42.7% 0.058 261.6)
-
Step 900
900
#344259
oklch(37.7% 0.044 260.2)
-
Step 950
950
#1F2734
oklch(27.1% 0.027 260)
#556E99 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) | #5E719B | 0.016 |
| Deuteranopia (no green cones) | #576A98 | 0.011 |
| Tritanopia (no blue cones) | #3C777D | 0.066 |
| Achromatopsia (no color) | #6D6D6D | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #556E99
#556E99
oklch(53.7% 0.074 261)
- #846939
#846939
oklch(53.7% 0.074 80.5)
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 #556E99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.022
- Metallic Blue #4F738E ΔE 0.027
- Muted Blue #3B719F ΔE 0.028
- Flat Blue #3C73A8 ΔE 0.033
- Stormy Blue #507B9C ΔE 0.037
- Cerulean #457B9D ΔE 0.038
- French Blue #436BAD ΔE 0.040
- Dusky Blue #475F94 ΔE 0.049
Use #556E99 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.