#516DEF
Closest named color: Royal Blue (#4169E1). oklch(58.6% 0.197 270.1), rgb(81, 109, 239).
Aa
Black text reads best on this color (4.78:1).
About this color
#516DEF is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.197 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.030 away. Black text reads best on it, at 4.78:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.197) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.78:1 |
| White text | 4.38:1 |
Values
| HEX | #516DEF |
| RGB | rgb(81, 109, 239) |
| HSL | hsl(229, 83%, 63%) |
| OKLCH | oklch(58.6% 0.197 270.1) |
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 #516DEF | 4.38:1 | AA large text | Lc -75.5 | Fine for body text |
| Black text on #516DEF | 4.78:1 | AA | Lc 34.1 | Non-text elements, placeholder text |
| #516DEF text on white | 4.38:1 | AA large text | Lc 70.0 | Content text, not long reading |
| #516DEF text on black | 4.78:1 | AA | Lc -31.7 | 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
#F2F5FE
oklch(97% 0.012 271.3)
-
Step 100
100
#E3E9FC
oklch(93.5% 0.027 271.9)
-
Step 200
200
#CCD8FB
oklch(88.4% 0.05 270.4)
-
Step 300
300
#AABEFB
oklch(80.8% 0.089 270.3)
-
Step 400
400
#7E9AF9
oklch(70.6% 0.143 270)
-
Step 500
500
#607EF6
oklch(63.1% 0.182 270)
-
Step 600
600 (this color)
#516DEF
oklch(58.6% 0.197 270.1)
-
Step 700
700
#3B51C7
oklch(49% 0.184 270.1)
-
Step 800
800
#3143A1
oklch(42.7% 0.153 270.3)
-
Step 900
900
#2A3A7F
oklch(37.6% 0.118 270)
-
Step 950
950
#19234B
oklch(27.1% 0.075 270.2)
#516DEF 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) | #0080F3 | 0.057 |
| Deuteranopia (no green cones) | #0072EC | 0.048 |
| Tritanopia (no blue cones) | #008CA3 | 0.163 |
| Achromatopsia (no color) | #787878 | 0.198 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516DEF
#516DEF
oklch(58.6% 0.197 270.1)
- #987800
#987800
oklch(58.7% 0.12 90)
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 #516DEF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.030
- Neon Blue #4361EE ΔE 0.035
- Clear Blue #247AFD ΔE 0.045
- Cornflower #6A79F7 ΔE 0.047
- Cerulean Blue #056EEE ΔE 0.048
- Medium Slate Blue #7B68EE ΔE 0.056
- Dark Periwinkle #665FD1 ΔE 0.058
- Bright Blue #0165FC ΔE 0.060
Use #516DEF 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.