#516ED1
Closest named color: Royal Blue (#4169E1). oklch(56.7% 0.156 268.8), rgb(81, 110, 209).
Aa
White text reads best on this color (4.66:1).
About this color
#516ED1 is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.156 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.034 away. White text reads best on it, at 4.66:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.156) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.50:1 |
| White text | 4.66:1 |
Values
| HEX | #516ED1 |
| RGB | rgb(81, 110, 209) |
| HSL | hsl(226, 58%, 57%) |
| OKLCH | oklch(56.7% 0.156 268.8) |
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 #516ED1 | 4.66:1 | AA | Lc -77.6 | Fine for body text |
| Black text on #516ED1 | 4.50:1 | AA | Lc 31.9 | Non-text elements, placeholder text |
| #516ED1 text on white | 4.66:1 | AA | Lc 72.1 | Content text, not long reading |
| #516ED1 text on black | 4.50:1 | AA | Lc -29.5 | 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
#CED9F4
oklch(88.5% 0.039 267.9)
-
Step 300
300
#AEBFEF
oklch(80.8% 0.071 269.6)
-
Step 400
400
#849DE7
oklch(70.7% 0.112 269.2)
-
Step 500
500
#6683E0
oklch(63.1% 0.144 269)
-
Step 600
600 (this color)
#516ED1
oklch(56.7% 0.156 268.8)
-
Step 700
700
#3F58B2
oklch(49% 0.146 268.8)
-
Step 800
800
#344990
oklch(42.8% 0.12 268.6)
-
Step 900
900
#2D3E73
oklch(37.8% 0.093 268.3)
-
Step 950
950
#1A2443
oklch(26.9% 0.06 268.7)
#516ED1 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) | #3D7AD5 | 0.034 |
| Deuteranopia (no green cones) | #266FCF | 0.038 |
| Tritanopia (no blue cones) | #008595 | 0.135 |
| Achromatopsia (no color) | #747474 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516ED1
#516ED1
oklch(56.7% 0.156 268.8)
- #927200
#927200
oklch(56.7% 0.116 89.1)
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 #516ED1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.034
- Dark Periwinkle #665FD1 ΔE 0.043
- Windows Blue #3778BF ΔE 0.048
- Slate Blue #6A5ACD ΔE 0.055
- Iris #6258C4 ΔE 0.057
- Light Indigo #6D5ACF ΔE 0.057
- French Blue #436BAD ΔE 0.059
- Neon Blue #4361EE ΔE 0.059
Use #516ED1 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.