#516FC8
Closest named color: Windows Blue (#3778BF). oklch(56.3% 0.142 267.7), rgb(81, 111, 200).
Aa
White text reads best on this color (4.71:1).
About this color
#516FC8 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.142 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.037 away. White text reads best on it, at 4.71:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.142) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.45:1 |
| White text | 4.71:1 |
Values
| HEX | #516FC8 |
| RGB | rgb(81, 111, 200) |
| HSL | hsl(225, 52%, 55%) |
| OKLCH | oklch(56.3% 0.142 267.7) |
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 #516FC8 | 4.71:1 | AA | Lc -77.9 | Fine for body text |
| Black text on #516FC8 | 4.45:1 | AA large text | Lc 31.6 | Non-text elements, placeholder text |
| #516FC8 text on white | 4.71:1 | AA | Lc 72.5 | Content text, not long reading |
| #516FC8 text on black | 4.45:1 | AA large text | Lc -29.2 | 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
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CFD9F1
oklch(88.5% 0.035 267.6)
-
Step 300
300
#AFC0EB
oklch(80.9% 0.064 268.1)
-
Step 400
400
#859EE1
oklch(70.7% 0.103 268.1)
-
Step 500
500
#6785D8
oklch(63.1% 0.13 267.6)
-
Step 600
600 (this color)
#516FC8
oklch(56.3% 0.142 267.7)
-
Step 700
700
#405BAB
oklch(49.2% 0.132 267.4)
-
Step 800
800
#354A8A
oklch(42.6% 0.109 267.9)
-
Step 900
900
#2E3F6F
oklch(37.8% 0.085 267.5)
-
Step 950
950
#1B2541
oklch(27% 0.054 267.8)
#516FC8 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) | #4679CB | 0.027 |
| Deuteranopia (no green cones) | #356EC6 | 0.029 |
| Tritanopia (no blue cones) | #008392 | 0.124 |
| Achromatopsia (no color) | #737373 | 0.142 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516FC8
#516FC8
oklch(56.3% 0.142 267.7)
- #927000
#927000
oklch(56.3% 0.115 87.4)
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 #516FC8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.037
- French Blue #436BAD ΔE 0.046
- Royal Blue #4169E1 ΔE 0.047
- Dark Periwinkle #665FD1 ΔE 0.049
- Mid Blue #276AB3 ΔE 0.055
- Iris #6258C4 ΔE 0.059
- Flat Blue #3C73A8 ΔE 0.059
- Slate Blue #6A5ACD ΔE 0.060
Use #516FC8 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.