#517CAA
Closest named color: Steel Blue (#4682B4). oklch(57.5% 0.086 251.1), rgb(81, 124, 170).
Aa
Black text reads best on this color (4.81:1).
About this color
#517CAA is a medium-dark, moderately saturated blue. In OKLCH its lightness is 57%, its chroma 0.086 and its hue 251°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.021 away. Black text reads best on it, at 4.81:1.
| Hue family | Blues |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.086) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.81:1 |
| White text | 4.36:1 |
Values
| HEX | #517CAA |
| RGB | rgb(81, 124, 170) |
| HSL | hsl(211, 35%, 49%) |
| OKLCH | oklch(57.5% 0.086 251.1) |
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 #517CAA | 4.36:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #517CAA | 4.81:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #517CAA text on white | 4.36:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #517CAA text on black | 4.81:1 | AA | Lc -31.5 | 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
#CFDAE7
oklch(88.4% 0.022 252.5)
-
Step 300
300
#AFC3D9
oklch(80.9% 0.038 250.8)
-
Step 400
400
#84A4C7
oklch(70.7% 0.063 251)
-
Step 500
500
#658DB8
oklch(63.1% 0.079 250.9)
-
Step 600
600 (this color)
#517CAA
oklch(57.5% 0.086 251.1)
-
Step 700
700
#3D638D
oklch(49% 0.081 252)
-
Step 800
800
#325172
oklch(42.6% 0.066 251)
-
Step 900
900
#2C435C
oklch(37.5% 0.052 251.3)
-
Step 950
950
#1A2836
oklch(27.1% 0.032 249.1)
#517CAA 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) | #697EAC | 0.030 |
| Deuteranopia (no green cones) | #5E75A9 | 0.023 |
| Tritanopia (no blue cones) | #22878C | 0.075 |
| Achromatopsia (no color) | #797979 | 0.086 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517CAA
#517CAA
oklch(57.5% 0.086 251.1)
- #99703C
#99703C
oklch(57.6% 0.086 71.2)
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 #517CAA, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.021
- Stormy Blue #507B9C ΔE 0.022
- Off Blue #5684AE ΔE 0.024
- Cerulean #457B9D ΔE 0.025
- Cool Blue #4984B8 ΔE 0.027
- Dull Blue #49759C ΔE 0.029
- Dusty Blue #5A86AD ΔE 0.031
- Flat Blue #3C73A8 ΔE 0.036
Use #517CAA 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.