#5666B4
Closest named color: French Blue (#436BAD). oklch(53.5% 0.123 272.8), rgb(86, 102, 180).
Aa
White text reads best on this color (5.30:1).
About this color
#5666B4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 53%, its chroma 0.123 and its hue 273°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.029 away. White text reads best on it, at 5.30:1.
| Hue family | Blues |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.123) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.95:1 |
| White text | 5.30:1 |
Values
| HEX | #5666B4 |
| RGB | rgb(86, 102, 180) |
| HSL | hsl(230, 39%, 52%) |
| OKLCH | oklch(53.5% 0.123 272.8) |
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 #5666B4 | 5.30:1 | AA | Lc -81.6 | Fine for body text |
| Black text on #5666B4 | 3.95:1 | AA large text | Lc 27.8 | Dividers and decoration only |
| #5666B4 text on white | 5.30:1 | AA | Lc 76.3 | Fine for body text |
| #5666B4 text on black | 3.95:1 | AA large text | Lc -25.5 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E6E9F5
oklch(93.5% 0.016 274.8)
-
Step 200
200
#D2D8EE
oklch(88.4% 0.031 273.6)
-
Step 300
300
#B4BFE5
oklch(80.9% 0.055 272.4)
-
Step 400
400
#8E9DD8
oklch(70.7% 0.088 273)
-
Step 500
500
#7384CE
oklch(63.1% 0.113 272.9)
-
Step 600
600 (this color)
#5666B4
oklch(53.5% 0.123 272.8)
-
Step 700
700
#4C5AA1
oklch(49.1% 0.114 273.1)
-
Step 800
800
#3E4A83
oklch(42.7% 0.095 272.8)
-
Step 900
900
#353E69
oklch(37.7% 0.074 273.4)
-
Step 950
950
#1F253D
oklch(27.1% 0.046 272.4)
#5666B4 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) | #466FB7 | 0.028 |
| Deuteranopia (no green cones) | #3C68B2 | 0.030 |
| Tritanopia (no blue cones) | #2C7784 | 0.110 |
| Achromatopsia (no color) | #6B6B6B | 0.124 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5666B4
#5666B4
oklch(53.5% 0.123 272.8)
- #836B00
#836B00
oklch(53.5% 0.11 93.3)
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 #5666B4, closest first.
No curated palette has a color within ΔE 0.04 of #5666B4.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.029
- Mid Blue #276AB3 ΔE 0.047
- Iris #6258C4 ΔE 0.048
- Flat Blue #3C73A8 ΔE 0.051
- Windows Blue #3778BF ΔE 0.054
- Dark Periwinkle #665FD1 ΔE 0.055
- Dusky Blue #475F94 ΔE 0.057
- Muted Blue #3B719F ΔE 0.058
Use #5666B4 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.