#517EB6
Closest named color: Steel Blue (#4682B4). oklch(58.5% 0.1 254.6), rgb(81, 126, 182).
Aa
Black text reads best on this color (5.00:1).
About this color
#517EB6 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 59%, its chroma 0.100 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.016 away. Black text reads best on it, at 5.00:1.
| Hue family | Blues |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.100) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 5.00:1 |
| White text | 4.19:1 |
Values
| HEX | #517EB6 |
| RGB | rgb(81, 126, 182) |
| HSL | hsl(213, 41%, 52%) |
| OKLCH | oklch(58.5% 0.1 254.6) |
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 #517EB6 | 4.19:1 | AA large text | Lc -74.3 | Content text, not long reading |
| Black text on #517EB6 | 5.00:1 | AA | Lc 35.3 | Non-text elements, placeholder text |
| #517EB6 text on white | 4.19:1 | AA large text | Lc 68.8 | Content text, not long reading |
| #517EB6 text on black | 5.00:1 | AA | Lc -32.9 | 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
#E4EAF3
oklch(93.5% 0.014 258.3)
-
Step 200
200
#CEDAEA
oklch(88.4% 0.026 255.6)
-
Step 300
300
#ADC3DE
oklch(80.9% 0.045 253.6)
-
Step 400
400
#82A3CD
oklch(70.6% 0.072 254.7)
-
Step 500
500
#628CC0
oklch(63.1% 0.092 254.3)
-
Step 600
600 (this color)
#517EB6
oklch(58.5% 0.1 254.6)
-
Step 700
700
#3A6294
oklch(49% 0.093 254.8)
-
Step 800
800
#305078
oklch(42.6% 0.077 254.7)
-
Step 900
900
#2B4361
oklch(37.8% 0.06 254.6)
-
Step 950
950
#192739
oklch(26.9% 0.039 255.1)
#517EB6 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) | #6781B8 | 0.028 |
| Deuteranopia (no green cones) | #5A77B5 | 0.021 |
| Tritanopia (no blue cones) | #0C8B92 | 0.088 |
| Achromatopsia (no color) | #7C7C7C | 0.100 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517EB6
#517EB6
oklch(58.5% 0.1 254.6)
- #9F722F
#9F722F
oklch(58.5% 0.1 74.1)
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 #517EB6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.016
- Cool Blue #4984B8 ΔE 0.017
- Off Blue #5684AE ΔE 0.025
- Dusty Blue #5A86AD ΔE 0.032
- Windows Blue #3778BF ΔE 0.035
- Stormy Blue #507B9C ΔE 0.040
- Cerulean #457B9D ΔE 0.042
- Flat Blue #3C73A8 ΔE 0.044
Use #517EB6 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.