#566EA3
Closest named color: Dull Blue (#49759C). oklch(54.2% 0.088 265), rgb(86, 110, 163).
Aa
White text reads best on this color (5.05:1).
About this color
#566EA3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.088 and its hue 265°. Its hue sits on the cool side of the wheel. The nearest named color is Dull Blue (#49759C), ΔE 0.029 away. White text reads best on it, at 5.05:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.088) |
| Temperature | cool |
| Nearest name | Dull Blue (#49759C) |
| Black text | 4.15:1 |
| White text | 5.05:1 |
Values
| HEX | #566EA3 |
| RGB | rgb(86, 110, 163) |
| HSL | hsl(221, 31%, 49%) |
| OKLCH | oklch(54.2% 0.088 265) |
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 #566EA3 | 5.05:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #566EA3 | 4.15:1 | AA large text | Lc 29.2 | Dividers and decoration only |
| #566EA3 text on white | 5.05:1 | AA | Lc 74.8 | Content text, not long reading |
| #566EA3 text on black | 4.15:1 | AA large text | Lc -26.9 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E6EAF2
oklch(93.6% 0.012 264.5)
-
Step 200
200
#D2D9E8
oklch(88.4% 0.022 265.8)
-
Step 300
300
#B4C1DB
oklch(80.9% 0.039 264.3)
-
Step 400
400
#8DA0C9
oklch(70.6% 0.064 265.4)
-
Step 500
500
#7189BB
oklch(63.1% 0.081 264.4)
-
Step 600
600 (this color)
#566EA3
oklch(54.2% 0.088 265)
-
Step 700
700
#4A5F90
oklch(49.1% 0.083 265.8)
-
Step 800
800
#3D4E74
oklch(42.7% 0.067 265.3)
-
Step 900
900
#34415E
oklch(37.7% 0.053 265.4)
-
Step 950
950
#1E2637
oklch(26.9% 0.034 264.8)
#566EA3 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) | #5A72A5 | 0.013 |
| Deuteranopia (no green cones) | #526BA2 | 0.010 |
| Tritanopia (no blue cones) | #387981 | 0.079 |
| Achromatopsia (no color) | #6F6F6F | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566EA3
#566EA3
oklch(54.2% 0.088 265)
- #876B2C
#876B2C
oklch(54.3% 0.088 84.9)
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 #566EA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Blue #49759C ΔE 0.029
- Flat Blue #3C73A8 ΔE 0.029
- French Blue #436BAD ΔE 0.030
- Muted Blue #3B719F ΔE 0.031
- Metallic Blue #4F738E ΔE 0.041
- Stormy Blue #507B9C ΔE 0.042
- Cerulean #457B9D ΔE 0.044
- Dusky Blue #475F94 ΔE 0.052
Use #566EA3 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.