#566FAC
Closest named color: French Blue (#436BAD). oklch(54.9% 0.1 266.3), rgb(86, 111, 172).
Aa
White text reads best on this color (4.92:1).
About this color
#566FAC is a medium-dark, moderately saturated blue. In OKLCH its lightness is 55%, its chroma 0.100 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.026 away. White text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 4.26:1 |
| White text | 4.92:1 |
Values
| HEX | #566FAC |
| RGB | rgb(86, 111, 172) |
| HSL | hsl(223, 34%, 51%) |
| OKLCH | oklch(54.9% 0.1 266.3) |
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 #566FAC | 4.92:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #566FAC | 4.26:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #566FAC text on white | 4.92:1 | AA | Lc 74.0 | Content text, not long reading |
| #566FAC text on black | 4.26:1 | AA large text | Lc -27.7 | 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
#F3F5FA
oklch(97% 0.007 268.5)
-
Step 100
100
#E6EAF3
oklch(93.7% 0.013 266.7)
-
Step 200
200
#D1D9EA
oklch(88.4% 0.025 265.6)
-
Step 300
300
#B3C1DF
oklch(81% 0.045 265.5)
-
Step 400
400
#8CA0CE
oklch(70.7% 0.071 266.3)
-
Step 500
500
#6F88C2
oklch(63.1% 0.093 266)
-
Step 600
600 (this color)
#566FAC
oklch(54.9% 0.1 266.3)
-
Step 700
700
#485E96
oklch(49% 0.094 266.7)
-
Step 800
800
#3B4D79
oklch(42.6% 0.077 266.3)
-
Step 900
900
#334162
oklch(37.9% 0.06 266.1)
-
Step 950
950
#1E2639
oklch(27% 0.037 266.4)
#566FAC 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) | #5875AF | 0.017 |
| Deuteranopia (no green cones) | #4E6DAB | 0.012 |
| Tritanopia (no blue cones) | #317C85 | 0.090 |
| Achromatopsia (no color) | #707070 | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #566FAC
#566FAC
oklch(54.9% 0.1 266.3)
- #8B6D1E
#8B6D1E
oklch(55% 0.101 86.8)
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 #566FAC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.026
- Flat Blue #3C73A8 ΔE 0.030
- Dull Blue #49759C ΔE 0.037
- Muted Blue #3B719F ΔE 0.038
- Windows Blue #3778BF ΔE 0.042
- Stormy Blue #507B9C ΔE 0.048
- Cerulean #457B9D ΔE 0.050
- Mid Blue #276AB3 ΔE 0.051
Use #566FAC 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.