#566C8F
Closest named color: Metallic Blue (#4F738E). oklch(52.8% 0.061 259.5), rgb(86, 108, 143).
Aa
White text reads best on this color (5.33:1).
About this color
#566C8F is a medium-dark, muted blue. In OKLCH its lightness is 53%, its chroma 0.061 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Metallic Blue (#4F738E), ΔE 0.022 away. White text reads best on it, at 5.33:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.061) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.93:1 |
| White text | 5.33:1 |
Values
| HEX | #566C8F |
| RGB | rgb(86, 108, 143) |
| HSL | hsl(217, 25%, 45%) |
| OKLCH | oklch(52.8% 0.061 259.5) |
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 #566C8F | 5.33:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #566C8F | 3.93:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #566C8F text on white | 5.33:1 | AA | Lc 76.5 | Fine for body text |
| #566C8F text on black | 3.93:1 | AA large text | Lc -25.2 | 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
#E7EAEF
oklch(93.6% 0.007 260.7)
-
Step 200
200
#D3DAE4
oklch(88.6% 0.016 257.2)
-
Step 300
300
#B6C1D3
oklch(80.8% 0.028 260.3)
-
Step 400
400
#91A2BD
oklch(70.8% 0.044 259.6)
-
Step 500
500
#758BAC
oklch(63.2% 0.056 258.3)
-
Step 600
600 (this color)
#566C8F
oklch(52.8% 0.061 259.5)
-
Step 700
700
#4D6181
oklch(48.9% 0.057 259.6)
-
Step 800
800
#405069
oklch(42.8% 0.046 259.2)
-
Step 900
900
#364255
oklch(37.7% 0.036 259.5)
-
Step 950
950
#202732
oklch(27.1% 0.023 259.3)
#566C8F 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) | #606E91 | 0.016 |
| Deuteranopia (no green cones) | #59698E | 0.009 |
| Tritanopia (no blue cones) | #437378 | 0.054 |
| Achromatopsia (no color) | #6B6B6B | 0.061 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566C8F
#566C8F
oklch(52.8% 0.061 259.5)
- #7E6741
#7E6741
oklch(52.7% 0.061 79.4)
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 #566C8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Metallic Blue #4F738E ΔE 0.022
- Dull Blue #49759C ΔE 0.030
- Muted Blue #3B719F ΔE 0.036
- Stormy Blue #507B9C ΔE 0.043
- Cerulean #457B9D ΔE 0.044
- Denim #3B638C ΔE 0.045
- Flat Blue #3C73A8 ΔE 0.045
- Slate #516572 ΔE 0.047
Use #566C8F 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.