#517CA3
Closest named color: Stormy Blue (#507B9C). oklch(57.1% 0.077 247), rgb(81, 124, 163).
Aa
Black text reads best on this color (4.76:1).
About this color
#517CA3 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.077 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.011 away. Black text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.077) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.76:1 |
| White text | 4.41:1 |
Values
| HEX | #517CA3 |
| RGB | rgb(81, 124, 163) |
| HSL | hsl(209, 34%, 48%) |
| OKLCH | oklch(57.1% 0.077 247) |
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 #517CA3 | 4.41:1 | AA large text | Lc -76.0 | Fine for body text |
| Black text on #517CA3 | 4.76:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #517CA3 text on white | 4.41:1 | AA large text | Lc 70.5 | Content text, not long reading |
| #517CA3 text on black | 4.76:1 | AA | Lc -31.2 | 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 600.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E5EBF0
oklch(93.7% 0.009 242.8)
-
Step 200
200
#CFDBE5
oklch(88.5% 0.019 243)
-
Step 300
300
#AFC3D6
oklch(80.8% 0.035 246.9)
-
Step 400
400
#85A4C2
oklch(70.6% 0.056 247.8)
-
Step 500
500
#668EB2
oklch(63.1% 0.07 246.3)
-
Step 600
600 (this color)
#517CA3
oklch(57.1% 0.077 247)
-
Step 700
700
#3D6487
oklch(49% 0.072 246.9)
-
Step 800
800
#33526E
oklch(42.7% 0.06 246.9)
-
Step 900
900
#2D4459
oklch(37.7% 0.046 246.9)
-
Step 950
950
#1B2834
oklch(27.1% 0.029 246.9)
#517CA3 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) | #6C7DA5 | 0.034 |
| Deuteranopia (no green cones) | #6174A2 | 0.028 |
| Tritanopia (no blue cones) | #298589 | 0.065 |
| Achromatopsia (no color) | #787878 | 0.077 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517CA3
#517CA3
oklch(57.1% 0.077 247)
- #966F44
#966F44
oklch(57.1% 0.077 68)
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 #517CA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.011
- Cerulean #457B9D ΔE 0.017
- Dull Blue #49759C ΔE 0.024
- Off Blue #5684AE ΔE 0.027
- Steel Blue #4682B4 ΔE 0.028
- Dusty Blue #5A86AD ΔE 0.033
- Cool Blue #4984B8 ΔE 0.035
- Metallic Blue #4F738E ΔE 0.037
Use #517CA3 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.