#516DD8
Closest named color: Royal Blue (#4169E1). oklch(56.9% 0.167 269.5), rgb(81, 109, 216).
Aa
White text reads best on this color (4.63:1).
About this color
#516DD8 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.167 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.026 away. White text reads best on it, at 4.63:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.167) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.52:1 |
| White text | 4.63:1 |
Values
| HEX | #516DD8 |
| RGB | rgb(81, 109, 216) |
| HSL | hsl(228, 63%, 58%) |
| OKLCH | oklch(56.9% 0.167 269.5) |
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 #516DD8 | 4.63:1 | AA | Lc -77.4 | Fine for body text |
| Black text on #516DD8 | 4.52:1 | AA | Lc 32.2 | Non-text elements, placeholder text |
| #516DD8 text on white | 4.63:1 | AA | Lc 71.9 | Content text, not long reading |
| #516DD8 text on black | 4.52:1 | AA | Lc -29.8 | 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
#F3F5FC
oklch(97.1% 0.01 273.4)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED9F6
oklch(88.6% 0.042 269)
-
Step 300
300
#ADBFF2
oklch(80.9% 0.075 269.5)
-
Step 400
400
#839CEC
oklch(70.7% 0.121 269.9)
-
Step 500
500
#6582E5
oklch(63.1% 0.152 269.4)
-
Step 600
600 (this color)
#516DD8
oklch(56.9% 0.167 269.5)
-
Step 700
700
#3F57B7
oklch(49.2% 0.154 269.4)
-
Step 800
800
#344794
oklch(42.6% 0.128 269.8)
-
Step 900
900
#2D3D76
oklch(37.8% 0.099 269.4)
-
Step 950
950
#1A2445
oklch(27% 0.063 269.2)
#516DD8 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) | #337BDC | 0.041 |
| Deuteranopia (no green cones) | #106FD6 | 0.047 |
| Tritanopia (no blue cones) | #008698 | 0.142 |
| Achromatopsia (no color) | #757575 | 0.167 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516DD8
#516DD8
oklch(56.9% 0.167 269.5)
- #927300
#927300
oklch(57% 0.116 89.9)
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 #516DD8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.026
- Dark Periwinkle #665FD1 ΔE 0.041
- Neon Blue #4361EE ΔE 0.049
- Slate Blue #6A5ACD ΔE 0.054
- Warm Blue #4B57DB ΔE 0.055
- Light Indigo #6D5ACF ΔE 0.056
- Cerulean Blue #056EEE ΔE 0.057
- Windows Blue #3778BF ΔE 0.057
Use #516DD8 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.