#517CA8
Closest named color: Stormy Blue (#507B9C). oklch(57.4% 0.083 250), rgb(81, 124, 168).
Aa
Black text reads best on this color (4.79:1).
About this color
#517CA8 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.083 and its hue 250°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.019 away. Black text reads best on it, at 4.79:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.083) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.79:1 |
| White text | 4.37:1 |
Values
| HEX | #517CA8 |
| RGB | rgb(81, 124, 168) |
| HSL | hsl(210, 35%, 49%) |
| OKLCH | oklch(57.4% 0.083 250) |
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 #517CA8 | 4.37:1 | AA large text | Lc -75.7 | Fine for body text |
| Black text on #517CA8 | 4.79:1 | AA | Lc 33.9 | Non-text elements, placeholder text |
| #517CA8 text on white | 4.37:1 | AA large text | Lc 70.2 | Content text, not long reading |
| #517CA8 text on black | 4.79:1 | AA | Lc -31.4 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E5EBF1
oklch(93.7% 0.01 247.9)
-
Step 200
200
#CFDBE7
oklch(88.6% 0.021 248.1)
-
Step 300
300
#AFC3D9
oklch(80.9% 0.038 250.8)
-
Step 400
400
#84A4C5
oklch(70.7% 0.06 249.5)
-
Step 500
500
#658DB7
oklch(63.1% 0.078 250.3)
-
Step 600
600 (this color)
#517CA8
oklch(57.4% 0.083 250)
-
Step 700
700
#3D648B
oklch(49.2% 0.077 249.6)
-
Step 800
800
#335171
oklch(42.6% 0.064 251)
-
Step 900
900
#2D445B
oklch(37.8% 0.049 249.2)
-
Step 950
950
#1A2835
oklch(27% 0.031 247.2)
#517CA8 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) | #6A7DAA | 0.031 |
| Deuteranopia (no green cones) | #5F75A7 | 0.024 |
| Tritanopia (no blue cones) | #24868B | 0.072 |
| Achromatopsia (no color) | #797979 | 0.083 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517CA8
#517CA8
oklch(57.4% 0.083 250)
- #986F3E
#986F3E
oklch(57.3% 0.084 69.7)
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 #517CA8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.019
- Cerulean #457B9D ΔE 0.022
- Steel Blue #4682B4 ΔE 0.023
- Off Blue #5684AE ΔE 0.024
- Dull Blue #49759C ΔE 0.027
- Cool Blue #4984B8 ΔE 0.029
- Dusty Blue #5A86AD ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.036
Use #517CA8 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.