#516ACF
Closest named color: Royal Blue (#4169E1). oklch(55.7% 0.158 270.1), rgb(81, 106, 207).
Aa
White text reads best on this color (4.86:1).
About this color
#516ACF is a medium-dark, vivid blue. In OKLCH its lightness is 56%, its chroma 0.158 and its hue 270°. Its hue sits on the cool side of the wheel. The nearest named color is Royal Blue (#4169E1), ΔE 0.032 away. White text reads best on it, at 4.86:1.
| Hue family | Blues |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.158) |
| Temperature | cool |
| Nearest name | Royal Blue (#4169E1) |
| Black text | 4.31:1 |
| White text | 4.86:1 |
Values
| HEX | #516ACF |
| RGB | rgb(81, 106, 207) |
| HSL | hsl(228, 57%, 56%) |
| OKLCH | oklch(55.7% 0.158 270.1) |
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 #516ACF | 4.86:1 | AA | Lc -78.9 | Fine for body text |
| Black text on #516ACF | 4.31:1 | AA large text | Lc 30.6 | Non-text elements, placeholder text |
| #516ACF text on white | 4.86:1 | AA | Lc 73.5 | Content text, not long reading |
| #516ACF text on black | 4.31:1 | AA large text | Lc -28.2 | 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
#CFD9F4
oklch(88.6% 0.039 269.4)
-
Step 300
300
#AFBFEF
oklch(80.9% 0.07 270.4)
-
Step 400
400
#859DE8
oklch(70.8% 0.114 269.8)
-
Step 500
500
#6882E1
oklch(63.1% 0.146 270.3)
-
Step 600
600 (this color)
#516ACF
oklch(55.7% 0.158 270.1)
-
Step 700
700
#4257B3
oklch(49% 0.148 270.4)
-
Step 800
800
#364891
oklch(42.7% 0.122 270.1)
-
Step 900
900
#2E3D73
oklch(37.6% 0.094 269.8)
-
Step 950
950
#1B2444
oklch(27% 0.061 270.1)
#516ACF 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) | #3677D3 | 0.038 |
| Deuteranopia (no green cones) | #1D6CCD | 0.044 |
| Tritanopia (no blue cones) | #008193 | 0.135 |
| Achromatopsia (no color) | #717171 | 0.158 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #516ACF
#516ACF
oklch(55.7% 0.158 270.1)
- #8D7000
#8D7000
oklch(55.8% 0.114 90.7)
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 #516ACF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Royal Blue #4169E1 ΔE 0.032
- Dark Periwinkle #665FD1 ΔE 0.037
- Slate Blue #6A5ACD ΔE 0.048
- Iris #6258C4 ΔE 0.048
- Light Indigo #6D5ACF ΔE 0.051
- Warm Blue #4B57DB ΔE 0.052
- Windows Blue #3778BF ΔE 0.053
- Neon Blue #4361EE ΔE 0.056
Use #516ACF 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.