#517FD5
Closest named color: Dark Sky Blue (#448EE4). oklch(60.5% 0.141 261.8), rgb(81, 127, 213).
Aa
Black text reads best on this color (5.34:1).
About this color
#517FD5 is a medium-dark, vivid blue. In OKLCH its lightness is 60%, its chroma 0.141 and its hue 262°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Sky Blue (#448EE4), ΔE 0.042 away. Black text reads best on it, at 5.34:1.
| Hue family | Blues |
| Lightness | medium-dark (60%) |
| Chroma | vivid (0.141) |
| Temperature | cool |
| Nearest name | Dark Sky Blue (#448EE4) |
| Black text | 5.34:1 |
| White text | 3.92:1 |
Values
| HEX | #517FD5 |
| RGB | rgb(81, 127, 213) |
| HSL | hsl(219, 61%, 58%) |
| OKLCH | oklch(60.5% 0.141 261.8) |
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 #517FD5 | 3.92:1 | AA large text | Lc -72.0 | Content text, not long reading |
| Black text on #517FD5 | 5.34:1 | AA | Lc 37.6 | Non-text elements, placeholder text |
| #517FD5 text on white | 3.92:1 | AA large text | Lc 66.4 | Content text, not long reading |
| #517FD5 text on black | 5.34:1 | AA | Lc -35.2 | 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
#E3EAF8
oklch(93.6% 0.02 264.5)
-
Step 200
200
#CBDAF3
oklch(88.5% 0.038 260.7)
-
Step 300
300
#A8C1EE
oklch(80.8% 0.07 262.1)
-
Step 400
400
#7AA0E5
oklch(70.6% 0.11 261.8)
-
Step 500
500 (this color)
#517FD5
oklch(60.5% 0.141 261.8)
-
Step 600
600
#3E6FCC
oklch(55.6% 0.154 261.8)
-
Step 700
700
#315CB0
oklch(49% 0.142 262.1)
-
Step 800
800
#294C8F
oklch(42.8% 0.118 261.9)
-
Step 900
900
#254072
oklch(37.7% 0.092 261.6)
-
Step 950
950
#162643
oklch(27.1% 0.058 261.5)
#517FD5 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) | #5987D8 | 0.024 |
| Deuteranopia (no green cones) | #467BD3 | 0.017 |
| Tritanopia (no blue cones) | #0092A0 | 0.118 |
| Achromatopsia (no color) | #808080 | 0.141 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517FD5
#517FD5
oklch(60.5% 0.141 261.8)
- #A77900
#A77900
oklch(60.6% 0.125 81.9)
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 #517FD5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Sky Blue #448EE4 ΔE 0.042
- Soft Blue #6488EA ΔE 0.045
- Windows Blue #3778BF ΔE 0.047
- Water Blue #0E87CC ΔE 0.047
- Cool Blue #4984B8 ΔE 0.051
- Steel Blue #4682B4 ΔE 0.056
- Cornflower #6A79F7 ΔE 0.063
- Chefchaouen Blue #4895EF ΔE 0.064
Use #517FD5 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.