#566C8A
Closest named color: Metallic Blue (#4F738E). oklch(52.6% 0.054 256.3), rgb(86, 108, 138).
Aa
White text reads best on this color (5.37:1).
About this color
#566C8A is a medium-dark, muted blue. In OKLCH its lightness is 53%, its chroma 0.054 and its hue 256°. 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 5.37:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.054) |
| Temperature | cool |
| Nearest name | Metallic Blue (#4F738E) |
| Black text | 3.90:1 |
| White text | 5.37:1 |
Values
| HEX | #566C8A |
| RGB | rgb(86, 108, 138) |
| HSL | hsl(215, 23%, 44%) |
| OKLCH | oklch(52.6% 0.054 256.3) |
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 #566C8A | 5.37:1 | AA | Lc -82.1 | Fine for body text |
| Black text on #566C8A | 3.90:1 | AA large text | Lc 27.3 | Dividers and decoration only |
| #566C8A text on white | 5.37:1 | AA | Lc 76.7 | Fine for body text |
| #566C8A text on black | 3.90:1 | AA large text | Lc -25.0 | 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
#D3DAE2
oklch(88.5% 0.013 251.6)
-
Step 300
300
#B7C2D1
oklch(81% 0.024 256.1)
-
Step 400
400
#91A2B9
oklch(70.7% 0.039 256)
-
Step 500
500
#768BA8
oklch(63.1% 0.05 256.5)
-
Step 600
600 (this color)
#566C8A
oklch(52.6% 0.054 256.3)
-
Step 700
700
#4E627D
oklch(49.1% 0.05 256)
-
Step 800
800
#405066
oklch(42.7% 0.042 256.4)
-
Step 900
900
#364253
oklch(37.6% 0.033 257.1)
-
Step 950
950
#202731
oklch(27% 0.021 257.3)
#566C8A 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) | #616D8B | 0.016 |
| Deuteranopia (no green cones) | #5B6889 | 0.013 |
| Tritanopia (no blue cones) | #457276 | 0.047 |
| Achromatopsia (no color) | #6A6A6A | 0.054 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566C8A
#566C8A
oklch(52.6% 0.054 256.3)
- #7D6646
#7D6646
oklch(52.5% 0.055 75.3)
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 #566C8A, 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 0.034
- Slate #516572 ΔE 0.040
- Muted Blue #3B719F ΔE 0.041
- Stormy Blue #507B9C ΔE 0.045
- Denim #3B638C ΔE 0.045
- Cerulean #457B9D ΔE 0.047
- Battleship Gray #6C757D ΔE 0.050
Use #566C8A 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.