#5166BD
Closest named color: French Blue (#436BAD). oklch(53.7% 0.138 270.9), rgb(81, 102, 189).
Aa
White text reads best on this color (5.26:1).
About this color
#5166BD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 54%, its chroma 0.138 and its hue 271°. Its hue sits on the cool side of the wheel. The nearest named color is French Blue (#436BAD), ΔE 0.035 away. White text reads best on it, at 5.26:1.
| Hue family | Blues |
| Lightness | medium-dark (54%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | French Blue (#436BAD) |
| Black text | 3.98:1 |
| White text | 5.26:1 |
Values
| HEX | #5166BD |
| RGB | rgb(81, 102, 189) |
| HSL | hsl(228, 45%, 53%) |
| OKLCH | oklch(53.7% 0.138 270.9) |
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 #5166BD | 5.26:1 | AA | Lc -81.3 | Fine for body text |
| Black text on #5166BD | 3.98:1 | AA large text | Lc 28.1 | Dividers and decoration only |
| #5166BD text on white | 5.26:1 | AA | Lc 76.0 | Fine for body text |
| #5166BD text on black | 3.98:1 | AA large text | Lc -25.8 | 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
#F3F5FB
oklch(97% 0.008 271.3)
-
Step 100
100
#E5EAF6
oklch(93.7% 0.017 267.8)
-
Step 200
200
#D0D8F1
oklch(88.4% 0.035 271.5)
-
Step 300
300
#B1BFEA
oklch(80.8% 0.063 270.8)
-
Step 400
400
#899DDF
oklch(70.6% 0.1 270.8)
-
Step 500
500
#6D84D6
oklch(63.2% 0.126 270.6)
-
Step 600
600 (this color)
#5166BD
oklch(53.7% 0.138 270.9)
-
Step 700
700
#4759A9
oklch(49.1% 0.129 271.4)
-
Step 800
800
#3A4989
oklch(42.6% 0.107 271.3)
-
Step 900
900
#313E6D
oklch(37.7% 0.082 270.4)
-
Step 950
950
#1D2540
oklch(27.1% 0.052 270.2)
#5166BD 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) | #3E71C0 | 0.033 |
| Deuteranopia (no green cones) | #2F67BB | 0.035 |
| Tritanopia (no blue cones) | #077988 | 0.123 |
| Achromatopsia (no color) | #6C6C6C | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #5166BD
#5166BD
oklch(53.7% 0.138 270.9)
- #866A00
#866A00
oklch(53.7% 0.11 90.4)
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 #5166BD, closest first.
No curated palette has a color within ΔE 0.04 of #5166BD.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- French Blue #436BAD ΔE 0.035
- Iris #6258C4 ΔE 0.042
- Mid Blue #276AB3 ΔE 0.045
- Dark Periwinkle #665FD1 ΔE 0.046
- Windows Blue #3778BF ΔE 0.051
- Slate Blue #6A5ACD ΔE 0.052
- Light Indigo #6D5ACF ΔE 0.056
- Royal Blue #4169E1 ΔE 0.057
Use #5166BD 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.