#516ACB
Closest named color: Royal Blue (#4169E1). oklch(55.5% 0.152 270), rgb(81, 106, 203).
Aa
White text reads best on this color (4.91:1).
About this color
#516ACB is a medium-dark, vivid blue. In OKLCH its lightness is 55%, its chroma 0.152 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.038 away. White text reads best on it, at 4.91:1.
| Hue family | Blues |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.27:1 |
| White text | 4.91:1 |
Values
| HEX | #516ACB |
| RGB | rgb(81, 106, 203) |
| HSL | hsl(228, 54%, 56%) |
| OKLCH | oklch(55.5% 0.152 270) |
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 #516ACB | 4.91:1 | AA | Lc -79.2 | Fine for body text |
| Black text on #516ACB | 4.27:1 | AA large text | Lc 30.3 | Non-text elements, placeholder text |
| #516ACB text on white | 4.91:1 | AA | Lc 73.8 | Content text, not long reading |
| #516ACB text on black | 4.27:1 | AA large text | Lc -27.9 | 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
#E4EAF8
oklch(93.7% 0.02 267.3)
-
Step 200
200
#CFD9F3
oklch(88.6% 0.037 268.9)
-
Step 300
300
#AFBFEE
oklch(80.9% 0.069 270.1)
-
Step 400
400
#869DE5
oklch(70.7% 0.109 269.9)
-
Step 500
500
#6983DE
oklch(63.2% 0.14 270)
-
Step 600
600 (this color)
#516ACB
oklch(55.5% 0.152 270)
-
Step 700
700
#4258B0
oklch(49% 0.142 269.9)
-
Step 800
800
#37498F
oklch(42.9% 0.117 270)
-
Step 900
900
#2F3D72
oklch(37.6% 0.092 270.3)
-
Step 950
950
#1B2443
oklch(26.9% 0.059 269.9)
#516ACB 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) | #3A76CF | 0.035 |
| Deuteranopia (no green cones) | #256BC9 | 0.040 |
| Tritanopia (no blue cones) | #008091 | 0.132 |
| Achromatopsia (no color) | #717171 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516ACB
#516ACB
oklch(55.5% 0.152 270)
- #8D6F00
#8D6F00
oklch(55.5% 0.113 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 #516ACB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.038
- Dark Periwinkle #665FD1 ΔE 0.038
- Iris #6258C4 ΔE 0.047
- Slate Blue #6A5ACD ΔE 0.049
- Windows Blue #3778BF ΔE 0.049
- French Blue #436BAD ΔE 0.051
- Light Indigo #6D5ACF ΔE 0.052
- Warm Blue #4B57DB ΔE 0.056
Use #516ACB 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.