#517BB0
Closest named color: Steel Blue (#4682B4). oklch(57.5% 0.095 254.8), rgb(81, 123, 176).
Aa
Black text reads best on this color (4.80:1).
About this color
#517BB0 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 58%, its chroma 0.095 and its hue 255°. Its hue sits on the cool side of the wheel. The nearest named color is Steel Blue (#4682B4), ΔE 0.020 away. Black text reads best on it, at 4.80:1.
| Hue family | Blues |
| Lightness | medium-dark (58%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Steel Blue (#4682B4) |
| Black text | 4.80:1 |
| White text | 4.36:1 |
Values
| HEX | #517BB0 |
| RGB | rgb(81, 123, 176) |
| HSL | hsl(213, 38%, 50%) |
| OKLCH | oklch(57.5% 0.095 254.8) |
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 #517BB0 | 4.36:1 | AA large text | Lc -75.6 | Fine for body text |
| Black text on #517BB0 | 4.80:1 | AA | Lc 34.0 | Non-text elements, placeholder text |
| #517BB0 text on white | 4.36:1 | AA large text | Lc 70.1 | Content text, not long reading |
| #517BB0 text on black | 4.80:1 | 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
#E4EAF2
oklch(93.5% 0.013 255.5)
-
Step 200
200
#CFDAE9
oklch(88.5% 0.024 256.1)
-
Step 300
300
#AFC3DC
oklch(81% 0.042 254.1)
-
Step 400
400
#84A3CB
oklch(70.7% 0.068 255)
-
Step 500
500
#658CBE
oklch(63.2% 0.087 255)
-
Step 600
600 (this color)
#517BB0
oklch(57.5% 0.095 254.8)
-
Step 700
700
#3C6292
oklch(49% 0.089 254.9)
-
Step 800
800
#325076
oklch(42.6% 0.073 254.9)
-
Step 900
900
#2C435F
oklch(37.7% 0.056 253.9)
-
Step 950
950
#1A2738
oklch(26.9% 0.037 255.4)
#517BB0 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) | #667EB2 | 0.028 |
| Deuteranopia (no green cones) | #5A75AF | 0.018 |
| Tritanopia (no blue cones) | #1A878E | 0.083 |
| Achromatopsia (no color) | #797979 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #517BB0
#517BB0
oklch(57.5% 0.095 254.8)
- #9A7032
#9A7032
oklch(57.5% 0.095 74.4)
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 #517BB0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Steel Blue #4682B4 ΔE 0.020
- Cool Blue #4984B8 ΔE 0.025
- Off Blue #5684AE ΔE 0.028
- Stormy Blue #507B9C ΔE 0.032
- Cerulean #457B9D ΔE 0.034
- Dull Blue #49759C ΔE 0.035
- Flat Blue #3C73A8 ΔE 0.035
- Windows Blue #3778BF ΔE 0.036
Use #517BB0 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.