#517DAF
Closest named color: Steel Blue (#4682B4). oklch(57.9% 0.092 252.5), rgb(81, 125, 175).
Aa
Black text reads best on this color (4.90:1).
About this color
#517DAF is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.092 and its hue 253°. 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 4.90:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.092) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.90:1 |
| White text | 4.28:1 |
Values
| HEX | #517DAF |
| RGB | rgb(81, 125, 175) |
| HSL | hsl(212, 37%, 50%) |
| OKLCH | oklch(57.9% 0.092 252.5) |
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 #517DAF | 4.28:1 | AA large text | Lc -75.0 | Content text, not long reading |
| Black text on #517DAF | 4.90:1 | AA | Lc 34.6 | Non-text elements, placeholder text |
| #517DAF text on white | 4.28:1 | AA large text | Lc 69.5 | Content text, not long reading |
| #517DAF text on black | 4.90:1 | AA | Lc -32.2 | 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
#F3F6F9
oklch(97.2% 0.005 247.9)
-
Step 100
100
#E4EBF2
oklch(93.7% 0.012 248)
-
Step 200
200
#CFDAE8
oklch(88.4% 0.023 254.4)
-
Step 300
300
#AEC3DB
oklch(80.9% 0.041 251.8)
-
Step 400
400
#83A4C9
oklch(70.8% 0.066 251.6)
-
Step 500
500
#648DBB
oklch(63.2% 0.083 252)
-
Step 600
600 (this color)
#517DAF
oklch(57.9% 0.092 252.5)
-
Step 700
700
#3B6390
oklch(49.1% 0.086 252.5)
-
Step 800
800
#315175
oklch(42.7% 0.071 252.4)
-
Step 900
900
#2C435E
oklch(37.7% 0.055 253.1)
-
Step 950
950
#1A2737
oklch(26.9% 0.035 254.1)
#517DAF 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) | #697FB1 | 0.030 |
| Deuteranopia (no green cones) | #5D76AE | 0.022 |
| Tritanopia (no blue cones) | #1B888E | 0.080 |
| Achromatopsia (no color) | #7A7A7A | 0.092 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517DAF
#517DAF
oklch(57.9% 0.092 252.5)
- #9B7137
#9B7137
oklch(57.9% 0.092 73)
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 #517DAF, 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 0.021
- Off Blue #5684AE ΔE 0.022
- Stormy Blue #507B9C ΔE 0.029
- Dusty Blue #5A86AD ΔE 0.030
- Cerulean #457B9D ΔE 0.032
- Dull Blue #49759C ΔE 0.036
- Flat Blue #3C73A8 ΔE 0.039
Use #517DAF 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.