#516EDB
Closest named color: Royal Blue (#4169E1). oklch(57.3% 0.169 269.3), rgb(81, 110, 219).
Aa
Black text reads best on this color (4.60:1).
About this color
#516EDB is a medium-dark, vivid blue. In OKLCH its lightness is 57%, its chroma 0.169 and its hue 269°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.025 away. Black text reads best on it, at 4.60:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.169) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.60:1 |
| White text | 4.56:1 |
Values
| HEX | #516EDB |
| RGB | rgb(81, 110, 219) |
| HSL | hsl(227, 66%, 59%) |
| OKLCH | oklch(57.3% 0.169 269.3) |
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 #516EDB | 4.56:1 | AA | Lc -76.8 | Fine for body text |
| Black text on #516EDB | 4.60:1 | AA | Lc 32.7 | Non-text elements, placeholder text |
| #516EDB text on white | 4.56:1 | AA | Lc 71.4 | Content text, not long reading |
| #516EDB text on black | 4.60:1 | AA | Lc -30.3 | Non-text elements, placeholder text |
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
#F3F5FD
oklch(97.1% 0.011 274.9)
-
Step 100
100
#E4EAF9
oklch(93.7% 0.021 268.4)
-
Step 200
200
#CED9F6
oklch(88.6% 0.042 269)
-
Step 300
300
#ADBFF3
oklch(80.9% 0.076 269.8)
-
Step 400
400
#829CED
oklch(70.6% 0.123 269.6)
-
Step 500
500
#6482E7
oklch(63.2% 0.155 269.2)
-
Step 600
600 (this color)
#516EDB
oklch(57.3% 0.169 269.3)
-
Step 700
700
#3E56B9
oklch(49.1% 0.158 269.5)
-
Step 800
800
#334795
oklch(42.6% 0.13 269.4)
-
Step 900
900
#2C3D77
oklch(37.8% 0.101 268.9)
-
Step 950
950
#1A2446
oklch(27.1% 0.065 269.4)
#516EDB 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) | #327CDF | 0.041 |
| Deuteranopia (no green cones) | #0A70D9 | 0.048 |
| Tritanopia (no blue cones) | #00879A | 0.143 |
| Achromatopsia (no color) | #767676 | 0.170 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516EDB
#516EDB
oklch(57.3% 0.169 269.3)
- #947400
#947400
oklch(57.4% 0.117 89.4)
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 #516EDB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.025
- Dark Periwinkle #665FD1 ΔE 0.043
- Neon Blue #4361EE ΔE 0.048
- Cerulean Blue #056EEE ΔE 0.055
- Slate Blue #6A5ACD ΔE 0.057
- Warm Blue #4B57DB ΔE 0.057
- Light Indigo #6D5ACF ΔE 0.058
- Windows Blue #3778BF ΔE 0.059
Use #516EDB 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.