#517AC3
Closest named color: Windows Blue (#3778BF). oklch(58.3% 0.122 261.2), rgb(81, 122, 195).
Aa
Black text reads best on this color (4.92:1).
About this color
#517AC3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.122 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Windows Blue (#3778BF), ΔE 0.027 away. Black text reads best on it, at 4.92:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.122) |
| Temperature | cool |
| Nearest name | Windows Blue (#3778BF) |
| Black text | 4.92:1 |
| White text | 4.26:1 |
Values
| HEX | #517AC3 |
| RGB | rgb(81, 122, 195) |
| HSL | hsl(218, 49%, 54%) |
| OKLCH | oklch(58.3% 0.122 261.2) |
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 #517AC3 | 4.26:1 | AA large text | Lc -74.8 | Content text, not long reading |
| Black text on #517AC3 | 4.92:1 | AA | Lc 34.8 | Non-text elements, placeholder text |
| #517AC3 text on white | 4.26:1 | AA large text | Lc 69.3 | Content text, not long reading |
| #517AC3 text on black | 4.92:1 | AA | Lc -32.3 | 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
#F3F6FB
oklch(97.2% 0.007 260.7)
-
Step 100
100
#E4EAF5
oklch(93.6% 0.016 262.8)
-
Step 200
200
#CEDAEE
oklch(88.5% 0.03 260.7)
-
Step 300
300
#ADC2E5
oklch(81% 0.055 260.6)
-
Step 400
400
#82A1D8
oklch(70.7% 0.088 261.6)
-
Step 500
500
#6289CD
oklch(63.1% 0.112 261)
-
Step 600
600 (this color)
#517AC3
oklch(58.3% 0.122 261.2)
-
Step 700
700
#3B5FA0
oklch(49.1% 0.113 261.3)
-
Step 800
800
#314E82
oklch(42.8% 0.093 261.3)
-
Step 900
900
#2B4168
oklch(37.7% 0.073 261.2)
-
Step 950
950
#19263D
oklch(26.9% 0.047 261.3)
#517AC3 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) | #5B80C6 | 0.021 |
| Deuteranopia (no green cones) | #4D76C1 | 0.012 |
| Tritanopia (no blue cones) | #008A95 | 0.106 |
| Achromatopsia (no color) | #7A7A7A | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517AC3
#517AC3
oklch(58.3% 0.122 261.2)
- #9F7200
#9F7200
oklch(58.2% 0.12 81.1)
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 #517AC3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Windows Blue #3778BF ΔE 0.027
- Cool Blue #4984B8 ΔE 0.037
- Steel Blue #4682B4 ΔE 0.037
- Water Blue #0E87CC ΔE 0.048
- Off Blue #5684AE ΔE 0.049
- Flat Blue #3C73A8 ΔE 0.051
- French Blue #436BAD ΔE 0.054
- Dusty Blue #5A86AD ΔE 0.055
Use #517AC3 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.