#517CC3
Closest named color: Windows Blue (#3778BF). oklch(58.8% 0.12 260), rgb(81, 124, 195).
Aa
Black text reads best on this color (5.02:1).
About this color
#517CC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.120 and its hue 260°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.029 away. Black text reads best on it, at 5.02:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.120) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 5.02:1 |
| White text | 4.18:1 |
Values
| HEX | #517CC3 |
| RGB | rgb(81, 124, 195) |
| HSL | hsl(217, 49%, 54%) |
| OKLCH | oklch(58.8% 0.12 260) |
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 #517CC3 | 4.18:1 | AA large text | Lc -74.1 | Content text, not long reading |
| Black text on #517CC3 | 5.02:1 | AA | Lc 35.4 | Non-text elements, placeholder text |
| #517CC3 text on white | 4.18:1 | AA large text | Lc 68.6 | Content text, not long reading |
| #517CC3 text on black | 5.02:1 | AA | Lc -33.0 | 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
#F3F6FA
oklch(97.2% 0.006 255.5)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAED
oklch(88.5% 0.029 259.6)
-
Step 300
300
#ADC2E4
oklch(81% 0.053 260)
-
Step 400
400
#81A2D7
oklch(70.8% 0.086 259.7)
-
Step 500
500
#618ACC
oklch(63.2% 0.11 259.6)
-
Step 600
600 (this color)
#517CC3
oklch(58.8% 0.12 260)
-
Step 700
700
#39609F
oklch(49.2% 0.111 259.6)
-
Step 800
800
#304E81
oklch(42.6% 0.092 260.4)
-
Step 900
900
#2A4167
oklch(37.6% 0.072 260)
-
Step 950
950
#19263D
oklch(26.9% 0.047 261.3)
#517CC3 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) | #5E82C6 | 0.024 |
| Deuteranopia (no green cones) | #5077C2 | 0.014 |
| Tritanopia (no blue cones) | #008C96 | 0.105 |
| Achromatopsia (no color) | #7C7C7C | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517CC3
#517CC3
oklch(58.8% 0.12 260)
- #A17309
#A17309
oklch(58.7% 0.119 80.1)
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 #517CC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.029
- Cool Blue #4984B8 ΔE 0.032
- Steel Blue #4682B4 ΔE 0.034
- Off Blue #5684AE ΔE 0.045
- Water Blue #0E87CC ΔE 0.045
- Dusty Blue #5A86AD ΔE 0.051
- Flat Blue #3C73A8 ΔE 0.053
- Nice Blue #107AB0 ΔE 0.056
Use #517CC3 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.