#517CA4
Closest named color: Stormy Blue (#507B9C). oklch(57.2% 0.078 247.6), rgb(81, 124, 164).
Aa
Black text reads best on this color (4.76:1).
About this color
#517CA4 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.078 and its hue 248°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.012 away. Black text reads best on it, at 4.76:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.078) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.76:1 |
| White text | 4.40:1 |
Values
| HEX | #517CA4 |
| RGB | rgb(81, 124, 164) |
| HSL | hsl(209, 34%, 48%) |
| OKLCH | oklch(57.2% 0.078 247.6) |
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 #517CA4 | 4.40:1 | AA large text | Lc -75.9 | Fine for body text |
| Black text on #517CA4 | 4.76:1 | AA | Lc 33.6 | Non-text elements, placeholder text |
| #517CA4 text on white | 4.40:1 | AA large text | Lc 70.4 | Content text, not long reading |
| #517CA4 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
#CFDBE6
oklch(88.6% 0.02 245.7)
-
Step 300
300
#AFC3D7
oklch(80.8% 0.036 248.3)
-
Step 400
400
#85A4C3
oklch(70.6% 0.057 248.6)
-
Step 500
500
#668EB3
oklch(63.2% 0.071 247.1)
-
Step 600
600 (this color)
#517CA4
oklch(57.2% 0.078 247.6)
-
Step 700
700
#3D6488
oklch(49% 0.073 247.6)
-
Step 800
800
#33526F
oklch(42.8% 0.061 247.8)
-
Step 900
900
#2D4459
oklch(37.7% 0.046 246.9)
-
Step 950
950
#1B2834
oklch(27.1% 0.029 246.9)
#517CA4 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) | #6C7DA6 | 0.034 |
| Deuteranopia (no green cones) | #6174A3 | 0.028 |
| Tritanopia (no blue cones) | #28858A | 0.066 |
| Achromatopsia (no color) | #787878 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517CA4
#517CA4
oklch(57.2% 0.078 247.6)
- #976F43
#976F43
oklch(57.2% 0.079 67.8)
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 #517CA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.012
- Cerulean #457B9D ΔE 0.018
- Dull Blue #49759C ΔE 0.025
- Off Blue #5684AE ΔE 0.026
- Steel Blue #4682B4 ΔE 0.027
- Dusty Blue #5A86AD ΔE 0.032
- Cool Blue #4984B8 ΔE 0.033
- Flat Blue #3C73A8 ΔE 0.038
Use #517CA4 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.