#517CA0
Closest named color: Stormy Blue (#507B9C). oklch(57% 0.074 244.9), rgb(81, 124, 160).
Aa
Black text reads best on this color (4.74:1).
About this color
#517CA0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.074 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Stormy Blue (#507B9C), ΔE 0.007 away. Black text reads best on it, at 4.74:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.074) |
| Temperature | cool |
| Nearest name | Stormy Blue (#507B9C) |
| Black text | 4.74:1 |
| White text | 4.42:1 |
Values
| HEX | #517CA0 |
| RGB | rgb(81, 124, 160) |
| HSL | hsl(207, 33%, 47%) |
| OKLCH | oklch(57% 0.074 244.9) |
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 #517CA0 | 4.42:1 | AA large text | Lc -76.1 | Fine for body text |
| Black text on #517CA0 | 4.74:1 | AA | Lc 33.4 | Non-text elements, placeholder text |
| #517CA0 text on white | 4.42:1 | AA large text | Lc 70.6 | Content text, not long reading |
| #517CA0 text on black | 4.74:1 | AA | Lc -31.0 | 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
#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
#B0C3D5
oklch(80.8% 0.033 246.8)
-
Step 400
400
#85A5C0
oklch(70.7% 0.053 244.1)
-
Step 500
500
#668EB0
oklch(63% 0.068 244.8)
-
Step 600
600 (this color)
#517CA0
oklch(57% 0.074 244.9)
-
Step 700
700
#3E6585
oklch(49.2% 0.068 244.6)
-
Step 800
800
#33526C
oklch(42.6% 0.057 245)
-
Step 900
900
#2D4458
oklch(37.7% 0.045 245.6)
-
Step 950
950
#1B2833
oklch(27% 0.027 244.6)
#517CA0 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) | #6D7CA2 | 0.035 |
| Deuteranopia (no green cones) | #63749F | 0.029 |
| Tritanopia (no blue cones) | #2C8588 | 0.062 |
| Achromatopsia (no color) | #787878 | 0.074 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517CA0
#517CA0
oklch(57% 0.074 244.9)
- #966E48
#966E48
oklch(57% 0.074 64)
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 #517CA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Stormy Blue #507B9C ΔE 0.007
- Cerulean #457B9D ΔE 0.014
- Dull Blue #49759C ΔE 0.023
- Off Blue #5684AE ΔE 0.029
- Steel Blue #4682B4 ΔE 0.032
- Metallic Blue #4F738E ΔE 0.034
- Dusty Blue #5A86AD ΔE 0.034
- Grey Blue #647D8E ΔE 0.036
Use #517CA0 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.