#516FBD
Closest named color: Windows Blue (#3778BF). oklch(55.6% 0.126 266.5), rgb(81, 111, 189).
Aa
White text reads best on this color (4.81:1).
About this color
#516FBD is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.126 and its hue 266°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.032 away. White text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.126) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.35:1 |
| White text | 4.81:1 |
Values
| HEX | #516FBD |
| RGB | rgb(81, 111, 189) |
| HSL | hsl(223, 45%, 53%) |
| OKLCH | oklch(55.6% 0.126 266.5) |
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 #516FBD | 4.81:1 | AA | Lc -78.7 | Fine for body text |
| Black text on #516FBD | 4.35:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #516FBD text on white | 4.81:1 | AA | Lc 73.2 | Content text, not long reading |
| #516FBD text on black | 4.35:1 | AA large text | Lc -28.4 | 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
#E5EAF5
oklch(93.6% 0.016 266.3)
-
Step 200
200
#CFD9EF
oklch(88.4% 0.032 266.1)
-
Step 300
300
#B0C0E6
oklch(80.8% 0.057 267.2)
-
Step 400
400
#869FDA
oklch(70.6% 0.091 266.4)
-
Step 500
500
#6986D0
oklch(63% 0.117 266.8)
-
Step 600
600 (this color)
#516FBD
oklch(55.6% 0.126 266.5)
-
Step 700
700
#425CA3
oklch(49% 0.118 266.9)
-
Step 800
800
#364C84
oklch(42.7% 0.097 266.2)
-
Step 900
900
#2F406A
oklch(37.8% 0.075 266.2)
-
Step 950
950
#1C253E
oklch(26.9% 0.049 268)
#516FBD 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) | #4E77C0 | 0.021 |
| Deuteranopia (no green cones) | #406DBB | 0.020 |
| Tritanopia (no blue cones) | #00808D | 0.113 |
| Achromatopsia (no color) | #727272 | 0.126 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516FBD
#516FBD
oklch(55.6% 0.126 266.5)
- #906E00
#906E00
oklch(55.7% 0.114 87.1)
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 #516FBD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.032
- French Blue #436BAD ΔE 0.032
- Flat Blue #3C73A8 ΔE 0.044
- Mid Blue #276AB3 ΔE 0.047
- Muted Blue #3B719F ΔE 0.056
- Steel Blue #4682B4 ΔE 0.058
- Nice Blue #107AB0 ΔE 0.059
- Dark Periwinkle #665FD1 ΔE 0.059
Use #516FBD 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.