#516FBF
Closest named color: Windows Blue (#3778BF). oklch(55.7% 0.129 266.7), rgb(81, 111, 191).
Aa
White text reads best on this color (4.79:1).
About this color
#516FBF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 56%, its chroma 0.129 and its hue 267°. 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 4.79:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | moderately saturated (0.129) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.37:1 |
| White text | 4.79:1 |
Values
| HEX | #516FBF |
| RGB | rgb(81, 111, 191) |
| HSL | hsl(224, 46%, 53%) |
| OKLCH | oklch(55.7% 0.129 266.7) |
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 #516FBF | 4.79:1 | AA | Lc -78.5 | Fine for body text |
| Black text on #516FBF | 4.37:1 | AA large text | Lc 31.0 | Non-text elements, placeholder text |
| #516FBF text on white | 4.79:1 | AA | Lc 73.1 | Content text, not long reading |
| #516FBF text on black | 4.37:1 | AA large text | Lc -28.6 | 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
#CFD9EF
oklch(88.4% 0.032 266.1)
-
Step 300
300
#B0C0E7
oklch(80.9% 0.058 267.6)
-
Step 400
400
#869FDB
oklch(70.7% 0.093 266.7)
-
Step 500
500
#6986D1
oklch(63.1% 0.118 267)
-
Step 600
600 (this color)
#516FBF
oklch(55.7% 0.129 266.7)
-
Step 700
700
#415CA4
oklch(49% 0.12 266.6)
-
Step 800
800
#364C85
oklch(42.8% 0.099 266.4)
-
Step 900
900
#2F3F6B
oklch(37.6% 0.078 267.5)
-
Step 950
950
#1B253E
oklch(26.8% 0.049 266.6)
#516FBF 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) | #4C77C2 | 0.021 |
| Deuteranopia (no green cones) | #3E6EBD | 0.021 |
| Tritanopia (no blue cones) | #00818E | 0.115 |
| Achromatopsia (no color) | #727272 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516FBF
#516FBF
oklch(55.7% 0.129 266.7)
- #916E00
#916E00
oklch(55.8% 0.114 86.4)
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 #516FBF, 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 0.034
- Flat Blue #3C73A8 ΔE 0.046
- Mid Blue #276AB3 ΔE 0.048
- Dark Periwinkle #665FD1 ΔE 0.057
- Muted Blue #3B719F ΔE 0.059
- Royal Blue #4169E1 ΔE 0.059
- Steel Blue #4682B4 ΔE 0.059
Use #516FBF 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.