#517FD3
Closest named color: Dark Sky Blue (#448EE4). oklch(60.3% 0.138 261.5), rgb(81, 127, 211).
Aa
Black text reads best on this color (5.32:1).
About this color
#517FD3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 60%, its chroma 0.138 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.043 away. Black text reads best on it, at 5.32:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | moderately saturated (0.138) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.32:1 |
| White text | 3.94:1 |
Values
| HEX | #517FD3 |
| RGB | rgb(81, 127, 211) |
| HSL | hsl(219, 60%, 57%) |
| OKLCH | oklch(60.3% 0.138 261.5) |
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 #517FD3 | 3.94:1 | AA large text | Lc -72.1 | Content text, not long reading |
| Black text on #517FD3 | 5.32:1 | AA | Lc 37.5 | Non-text elements, placeholder text |
| #517FD3 text on white | 3.94:1 | AA large text | Lc 66.6 | Content text, not long reading |
| #517FD3 text on black | 5.32:1 | AA | Lc -35.1 | 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
#F2F6FC
oklch(97.2% 0.009 258.3)
-
Step 100
100
#E3EAF7
oklch(93.6% 0.019 263)
-
Step 200
200
#CCDAF3
oklch(88.6% 0.038 262.1)
-
Step 300
300
#A9C2ED
oklch(81% 0.067 261.2)
-
Step 400
400
#7BA1E4
oklch(70.8% 0.107 261.3)
-
Step 500
500 (this color)
#517FD3
oklch(60.3% 0.138 261.5)
-
Step 600
600
#3F70CA
oklch(55.7% 0.149 261.4)
-
Step 700
700
#315DAF
oklch(49.2% 0.14 261.5)
-
Step 800
800
#294C8D
oklch(42.6% 0.115 261.5)
-
Step 900
900
#254071
oklch(37.7% 0.09 261.4)
-
Step 950
950
#162642
oklch(27% 0.057 260.9)
#517FD3 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) | #5A87D6 | 0.025 |
| Deuteranopia (no green cones) | #487BD1 | 0.015 |
| Tritanopia (no blue cones) | #00929F | 0.117 |
| Achromatopsia (no color) | #808080 | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517FD3
#517FD3
oklch(60.3% 0.138 261.5)
- #A67800
#A67800
oklch(60.3% 0.124 81.7)
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 #517FD3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.043
- Windows Blue #3778BF ΔE 0.045
- Water Blue #0E87CC ΔE 0.046
- Soft Blue #6488EA ΔE 0.047
- Cool Blue #4984B8 ΔE 0.048
- Steel Blue #4682B4 ΔE 0.053
- Off Blue #5684AE ΔE 0.062
- Faded Blue #658CBB ΔE 0.062
Use #517FD3 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.