#516CC8
Closest named color: Windows Blue (#3778BF). oklch(55.7% 0.146 269), rgb(81, 108, 200).
Aa
White text reads best on this color (4.85:1).
About this color
#516CC8 is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.146 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.043 away. White text reads best on it, at 4.85:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.146) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.32:1 |
| White text | 4.85:1 |
Values
| HEX | #516CC8 |
| RGB | rgb(81, 108, 200) |
| HSL | hsl(226, 52%, 55%) |
| OKLCH | oklch(55.7% 0.146 269) |
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 #516CC8 | 4.85:1 | AA | Lc -78.8 | Fine for body text |
| Black text on #516CC8 | 4.32:1 | AA large text | Lc 30.7 | Non-text elements, placeholder text |
| #516CC8 text on white | 4.85:1 | AA | Lc 73.4 | Content text, not long reading |
| #516CC8 text on black | 4.32:1 | AA large text | Lc -28.3 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF7
oklch(93.6% 0.019 266)
-
Step 200
200
#CFD9F2
oklch(88.5% 0.036 268.3)
-
Step 300
300
#AFC0EC
oklch(81% 0.065 268.4)
-
Step 400
400
#869EE2
oklch(70.8% 0.104 268.8)
-
Step 500
500
#6884DA
oklch(63.1% 0.134 268.8)
-
Step 600
600 (this color)
#516CC8
oklch(55.7% 0.146 269)
-
Step 700
700
#4259AD
oklch(49% 0.136 269.3)
-
Step 800
800
#364A8C
oklch(42.8% 0.112 268.7)
-
Step 900
900
#2F3E70
oklch(37.7% 0.088 269.3)
-
Step 950
950
#1B2541
oklch(27% 0.054 267.8)
#516CC8 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) | #4077CB | 0.031 |
| Deuteranopia (no green cones) | #2E6CC6 | 0.034 |
| Tritanopia (no blue cones) | #008190 | 0.128 |
| Achromatopsia (no color) | #717171 | 0.146 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516CC8
#516CC8
oklch(55.7% 0.146 269)
- #8E6F00
#8E6F00
oklch(55.6% 0.114 89.2)
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 #516CC8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.043
- Royal Blue #4169E1 ΔE 0.043
- Dark Periwinkle #665FD1 ΔE 0.044
- French Blue #436BAD ΔE 0.046
- Iris #6258C4 ΔE 0.052
- Slate Blue #6A5ACD ΔE 0.054
- Mid Blue #276AB3 ΔE 0.054
- Light Indigo #6D5ACF ΔE 0.057
Use #516CC8 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.