#516DFB
Closest named color: Neon Blue (#4361EE). oklch(59.5% 0.213 270.2), rgb(81, 109, 251).
Aa
Black text reads best on this color (4.93:1).
About this color
#516DFB is a medium-dark, vivid blue. In OKLCH its lightness is 59%, its chroma 0.213 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.039 away. Black text reads best on it, at 4.93:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | vivid (0.213) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.93:1 |
| White text | 4.25:1 |
Values
| HEX | #516DFB |
| RGB | rgb(81, 109, 251) |
| HSL | hsl(230, 96%, 65%) |
| OKLCH | oklch(59.5% 0.213 270.2) |
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 #516DFB | 4.25:1 | AA large text | Lc -74.4 | Content text, not long reading |
| Black text on #516DFB | 4.93:1 | AA | Lc 35.1 | Non-text elements, placeholder text |
| #516DFB text on white | 4.25:1 | AA large text | Lc 68.9 | Content text, not long reading |
| #516DFB text on black | 4.93:1 | AA | Lc -32.7 | 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 500.
-
Step 50
50
#F2F5FF
oklch(97.1% 0.014 272.7)
-
Step 100
100
#E2E9FF
oklch(93.5% 0.031 271.7)
-
Step 200
200
#CBD8FF
oklch(88.5% 0.056 270.7)
-
Step 300
300
#A9BEFF
oklch(80.9% 0.095 270.4)
-
Step 400
400
#7C99FF
oklch(70.6% 0.153 270.2)
-
Step 500
500 (this color)
#516DFB
oklch(59.5% 0.213 270.2)
-
Step 600
600
#445CF8
oklch(55.6% 0.232 270.1)
-
Step 700
700
#374AD8
oklch(49.1% 0.216 270.1)
-
Step 800
800
#2D3EAE
oklch(42.6% 0.178 270.1)
-
Step 900
900
#27378A
oklch(37.7% 0.139 270.1)
-
Step 950
950
#172151
oklch(27% 0.089 270.5)
#516DFB 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) | #0083FF | 0.061 |
| Deuteranopia (no green cones) | #0073F8 | 0.047 |
| Tritanopia (no blue cones) | #0090A9 | 0.174 |
| Achromatopsia (no color) | #7B7B7B | 0.213 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516DFB
#516DFB
oklch(59.5% 0.213 270.2)
- #9B7A00
#9B7A00
oklch(59.5% 0.121 89.7)
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 #516DFB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.039
- Clear Blue #247AFD ΔE 0.041
- Royal Blue #4169E1 ΔE 0.045
- Cornflower #6A79F7 ΔE 0.045
- Cerulean Blue #056EEE ΔE 0.053
- Bright Blue #0165FC ΔE 0.057
- Medium Slate Blue #7B68EE ΔE 0.058
- Azul #1D5DEC ΔE 0.068
Use #516DFB 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.